Common Weakness Enumeration
CWE-347
AllowedImproper Verification of Cryptographic Signature
Abstraction: Base · Status: Draft
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
1262 vulnerabilities reference this CWE, most recent first.
CVE-2026-48523 (GCVE-0-2026-48523)
Vulnerability from cvelistv5 – Published: 2026-05-28 15:10 – Updated: 2026-05-28 15:27
VLAI
EPSS
VEX
Title
PyJWT: Algorithm allow-list bypass when decoding with `PyJWK` / `PyJWKClient` keys
Summary
PyJWT is a JSON Web Token implementation in Python. From 2.9.0 to 2.12.1, there is a verifier-side algorithm allow-list bypass when jwt.decode() or jwt.decode_complete() are called with a PyJWK key. The token header alg is checked against the caller-supplied algorithms allow-list, but signature verification is performed with the algorithm bound to the PyJWK object instead of the header algorithm. An attacker who controls a registered JWK/JWKS private key can sign with a disallowed algorithm, advertise an allowed algorithm in the JWT header, and still be accepted. The issue affects the documented PyJWKClient.get_signing_key_from_jwt(...) flow. This vulnerability is fixed in 2.13.0.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-28 15:27 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/jpadilla/pyjwt/security/adviso… | x_refsource_CONFIRM |
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CVE-2026-48021 (GCVE-0-2026-48021)
Vulnerability from cvelistv5 – Published: 2026-07-24 18:26 – Updated: 2026-07-25 00:57
VLAI
EPSS
VEX
Title
epa4all Security Incident: Implement keystore based on Telematik TSL, implement hostname check and certificate check for lib-vau
Summary
In epa4all, prior to version 2026-05-20, an attacker who can intercept the TLS connection between epa4all and the ePA backend can complete the VAU handshake with attacker-controlled keys and obtain the session encryption keys. All inner HTTP traffic (patient consent decisions, medication data, document operations, authorization tokens, and entitlement queries) becomes readable and modifiable. The attacker can also inject arbitrary requests through the hijacked channel. This issue has been patched in version 2026-05-20.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-25 00:56 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/med-united/epa4all/security/ad… | x_refsource_CONFIRM |
| https://github.com/med-united/epa4all/releases/ta… | x_refsource_MISC |
| https://www.machinespirits.com/advisory/aa49f0 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| med-united | epa4all |
Affected:
< 2026-05-20
|
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CVE-2026-47304 (GCVE-0-2026-47304)
Vulnerability from cvelistv5 – Published: 2026-07-14 18:45 – Updated: 2026-08-28 17:51
VLAI
EPSS
VEX
Title
.NET Security Feature Bypass Vulnerability
Summary
Improper verification of cryptographic signature in .NET allows an unauthorized attacker to bypass a security feature over a network.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 03:57 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
16 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | .NET 10.0 |
Affected:
10.0.0 , < 10.0.10
(custom)
|
|
| Microsoft | .NET 8.0 |
Affected:
8.0.0 , < 8.0.29
(custom)
|
|
| Microsoft | .NET 9.0 |
Affected:
9.0.0 , < 9.0.18
(custom)
|
|
| Microsoft | Microsoft .NET Framework 3.5 |
Affected:
3.5.0 , < 2.0.50727.8983 & 3.0.30729.8978
(custom)
|
|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 |
Affected:
4.7.0 , < 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
(custom)
|
|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8 |
Affected:
4.8.0 , < 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
(custom)
|
|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.8.1 |
Affected:
4.8.1 , < 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
(custom)
|
|
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 |
Affected:
4.7.0 , < 4.7.4143.0
(custom)
|
|
| Microsoft | Microsoft .NET Framework 4.8 |
Affected:
4.8.0 , < 4.8.4803.0
(custom)
|
|
| Microsoft | Microsoft .NET Framework 4.8.1 |
Affected:
4.8.0.0 , < 4.8.9340.0
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) |
Affected:
-
|
|
| Microsoft | Microsoft Visual Studio 2019 version 16.11 (includes 16.0 - 16.10) |
Affected:
-
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.12 |
Affected:
17.12.0 , < 17.12.22
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.14 |
Affected:
17.14.0 , < 17.14.36
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2026 version 18.5 |
Affected:
-
|
|
| Microsoft | Microsoft Visual Studio 2026 version 18.7 |
Affected:
18.0 , < 18.7.4
(custom)
|
Date Public
2026-07-14 14:00
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CVE-2026-47212 (GCVE-0-2026-47212)
Vulnerability from cvelistv5 – Published: 2026-07-14 19:00 – Updated: 2026-07-15 14:04
VLAI
EPSS
VEX
Title
Symfony: Twilio Notifier Webhook Parser Never Verifies the X-Twilio-Signature HMAC: Unauthenticated Webhook Event Injection
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 6.4.40, 7.4.12, and 8.0.12, TwilioRequestParser::doParse() received the configured webhook secret but ignored the X-Twilio-Signature HMAC header, allowing unauthenticated POST requests to inject forged Twilio status payloads. This issue is fixed in versions 6.4.40, 7.4.12, and 8.0.12.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 14:04 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/symfony/symfony/security/advis… | x_refsource_CONFIRM |
| https://github.com/symfony/symfony/commit/8545fb2… | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v6.4.40 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v7.4.12 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v8.0.12 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| symfony | symfony |
Affected:
>= 6.4.0, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12 Affected: >= 8.0.0-BETA1, < 8.0.12 |
|
| symfony | twilio-notifier |
Affected:
>= 6.4.0, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12 Affected: >= 8.0.0-BETA1, < 8.0.12 |
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CVE-2026-47192 (GCVE-0-2026-47192)
Vulnerability from cvelistv5 – Published: 2026-08-14 16:41 – Updated: 2026-08-14 19:28
VLAI
EPSS
VEX
Title
kas's late signature validation may allow unnoticed repository manipulations
Summary
kas is a setup tool for bitbake based projects. Starting in version 4.8 and prior to version 5.3, kas checks out and processes repositories regarding configuration includes prior to validating signatures of those repositories. This may allow to replace on original repository with one under the control of an attacker under very specific conditions. First of all, the attacker must have gained control of a repository that a kas file of the victim is referencing. Furthermore, the following conditions must be fulfilled: the victim's kas configuration must include a configuration file from the attacked repository; the repository state is referenced by tag, and no commit ID is specified (this is triggering a warning, though); the key used for validating the tag or commit signature is stored as file in a repository; no fingerprint for the key is specified; and the `_source_dir` key must not be set by the victim when calling kas (e.g. by avoiding a local `.config.yaml`). Given these conditions, the attacker could modify the included kas configuration in way that the key used to validate the tag signature of the attacker's repository could be replaced by an attacker-chosen key. No other exploit possibilities have been identified so far, but this does not rule out that those may exist. All patches have been released along with kas version 5.3. As a workaround, pin the expected signature key via its fingerprint, also when storing it as file in a repository.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 19:27 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/siemens/kas/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/siemens/kas/security/advisorie… | x_refsource_MISC |
| https://github.com/siemens/kas/commit/4cb4a3d0112… | x_refsource_MISC |
| https://github.com/siemens/kas/commit/5b2114becfc… | x_refsource_MISC |
| https://github.com/pypa/advisory-database/tree/ma… | x_refsource_MISC |
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CVE-2026-47191 (GCVE-0-2026-47191)
Vulnerability from cvelistv5 – Published: 2026-08-14 16:35 – Updated: 2026-08-18 02:10
VLAI
EPSS
VEX
Title
kas checks out SHA-like git branches as valid commits
Summary
kas is a setup tool for bitbake based projects. Prior to version 5.3, when relying solely on a git commit ID (SHA-1 or SHA-256) to qualify if a checkout of a repository is equivalent to the state validated while adding its commit ID to a kas configuration, users may be tricked to check out a branch of the same name from this repository. This implies that the referenced repository has been taken over by an attacker and modified to carry such a branch. SHA-1 commits may also be replaced by creating hash collisions, so the primary impact of this issue is on SHA-256 commit IDs. Version 5.3 fixes the issue. As a workaround, avoid relying solely on the commit ID for integrity validation of a repository that might become under control of a malicious 3rd party. If available, additional validate cryptographically signed commits or tags. Alternatively, mirror the repository to a save place, validate its integrity, and use this instead of the original one.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 02:10 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/siemens/kas/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/siemens/kas/commit/4cb4a3d0112… | x_refsource_MISC |
| https://github.com/pypa/advisory-database/tree/ma… | x_refsource_MISC |
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CVE-2026-46713 (GCVE-0-2026-46713)
Vulnerability from cvelistv5 – Published: 2026-08-03 21:37 – Updated: 2026-08-04 15:44
VLAI
EPSS
VEX
Title
Misskey: JSON-LD signature validation + compaction may lead to improper activity handling
Summary
Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 15:44 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/misskey-dev/misskey/security/a… | x_refsource_CONFIRM |
| https://github.com/misskey-dev/misskey/releases/t… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| misskey-dev | misskey |
Affected:
>= 12.37.0, < 2026.5.4
|
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CVE-2026-46684 (GCVE-0-2026-46684)
Vulnerability from cvelistv5 – Published: 2026-07-15 19:41 – Updated: 2026-07-17 18:18
VLAI
EPSS
VEX
Title
DataEase: Unauthorized Command Execution Vulnerability
Summary
DataEase is an open source data visualization and analysis tool. Prior to 2.10.23, DataEase enterprise token handling can let TokenFilter#doFilter() pass X-DE-TOKEN values to TokenUtils.validate(), which checks only token presence and length before userBOByToken(token) uses JWT.decode() without signature verification, allowing forged tokens with chosen uid and oid values to be accepted when licenseValid=true. This issue is fixed in version 2.10.23.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 18:18 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/dataease/dataease/security/adv… | x_refsource_CONFIRM |
| https://github.com/dataease/dataease/commit/3efda… | x_refsource_MISC |
| https://github.com/dataease/dataease/releases/tag… | x_refsource_MISC |
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CVE-2026-46423 (GCVE-0-2026-46423)
Vulnerability from cvelistv5 – Published: 2026-06-24 20:58 – Updated: 2026-06-26 03:55
VLAI
EPSS
VEX
Title
Rocket.Chat: SAML signature validation skipped when IdP certificate field is empty
Summary
Rocket.Chat is an open-source, secure, fully customizable communications platform. Prior to 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11, Rocket.Chat's SAML service provider implementation silently skips both SAML Response and Assertion signature validation when the configured IdP certificate field is empty. The verifySignatures routine performs an early return when serviceProviderOptions.cert is falsy, which is the default state of the setting. Because provider registration only gates on the SAML "enabled" toggle and not on the presence of a certificate, an administrator who enables SAML without pasting an IdP certificate obtains a fully wired, publicly reachable SAML login endpoint that accepts unsigned or attacker-supplied assertions. This is a default-configuration authentication-bypass class: the fail-open branch is reached with no misconfiguration beyond leaving a field at its shipped default. This vulnerability is fixed in 8.5.0, 8.4.1, 8.3.3, 8.2.3, 8.1.4, 8.0.5, 7.13.7, and 7.10.11.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-25 00:00 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/RocketChat/Rocket.Chat/securit… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| RocketChat | Rocket.Chat |
Affected:
>= 8.5.0-rc.0, < 8.5.0
Affected: >= 8.4.0-rc.0, < 8.4.1 Affected: >= 8.3.0-rc.0, < 8.3.3 Affected: >= 8.2.0-rc.0, < 8.2.3 Affected: >= 8.1.0-rc.0, < 8.1.4 Affected: >= 8.0.0-rc.0, < 8.0.5 Affected: >= 7.11.0-rc.0, < 7.13.7 Affected: < 7.10.11 |
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CVE-2026-46354 (GCVE-0-2026-46354)
Vulnerability from cvelistv5 – Published: 2026-07-07 21:10 – Updated: 2026-07-08 13:01
VLAI
EPSS
VEX
Title
Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft
Summary
Coder allows organizations to provision remote development environments via Terraform. In versions prior tp 2.24.5, 2.29.13, 2.30.8, 2.31.12, 2.32.2, and 2.33.3, `azureidentity.Validate()` verifies that the PKCS#7 signer certificate chains to a trusted Azure CA but never verifies the PKCS#7 signature itself. An attacker can embed a legitimate Azure certificate alongside arbitrary content e.g. `{"vmId":"<target>"}` and the forged `vmId` will be accepted returning the victim workspace agent's session token. No authentication is required. The attacker only needs to know a target VM's `vmId` which is a `UUIDv4`. That's a practical limitation which would typically require prior access to be exploited. Versions 2.24.5, 2.29.13, 2.30.8, 2.31.12, 2.32.2, and 2.33.3 patch the issue. As a workaround, reconfigure any Azure templates to use token authentication rather than `azure-instance-identity`.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 13:01 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/coder/coder/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/coder/coder/pull/25286 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.24.5 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.29.13 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.30.8 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.31.12 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.32.2 | x_refsource_MISC |
| https://github.com/coder/coder/releases/tag/v2.33.3 | x_refsource_MISC |
Impacted products
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 9.1,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-07T21:10:01.899Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/coder/coder/security/advisories/GHSA-6x44-w3xg-hqqf",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/coder/coder/security/advisories/GHSA-6x44-w3xg-hqqf"
},
{
"name": "https://github.com/coder/coder/pull/25286",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coder/coder/pull/25286"
},
{
"name": "https://github.com/coder/coder/releases/tag/v2.24.5",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coder/coder/releases/tag/v2.24.5"
},
{
"name": "https://github.com/coder/coder/releases/tag/v2.29.13",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coder/coder/releases/tag/v2.29.13"
},
{
"name": "https://github.com/coder/coder/releases/tag/v2.30.8",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coder/coder/releases/tag/v2.30.8"
},
{
"name": "https://github.com/coder/coder/releases/tag/v2.31.12",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coder/coder/releases/tag/v2.31.12"
},
{
"name": "https://github.com/coder/coder/releases/tag/v2.32.2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coder/coder/releases/tag/v2.32.2"
},
{
"name": "https://github.com/coder/coder/releases/tag/v2.33.3",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coder/coder/releases/tag/v2.33.3"
}
],
"source": {
"advisory": "GHSA-6x44-w3xg-hqqf",
"discovery": "UNKNOWN"
},
"title": "Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-46354",
"datePublished": "2026-07-07T21:10:01.899Z",
"dateReserved": "2026-05-13T18:37:30.991Z",
"dateUpdated": "2026-07-08T13:01:25.192Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
No mitigation information available for this CWE.
CAPEC-463: Padding Oracle Crypto Attack
An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.
CAPEC-475: Signature Spoofing by Improper Validation
An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.