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-2026-75759 (GCVE-0-2026-75759)
Vulnerability from cvelistv5 – Published: 2026-08-30 01:12 – Updated: 2026-08-30 01:12
VLAI
EPSS
VEX
Title
Encrypted ID token or JARM response accepted without a nested signature in erlef oidcc
Summary
Improper Verification of Cryptographic Signature vulnerability in erlef oidcc allows an unauthenticated attacker to impersonate an arbitrary user via an encrypted ID token or JARM response carrying no nested signature. OpenID Connect Core 1.0 section 2 requires that an encrypted ID token be signed then encrypted, with the result being a Nested JWT, and JARM processing rule 5 requires the client to check the signature unconditionally. oidcc instead accepted a JWE wrapping unsigned claims as fully validated, so anyone holding the relying party's public encryption key could mint a token with an arbitrary sub, iss, and aud without possessing the provider's signing key.
In oidcc_jwt_util:verify_decrypted_token/4, a decrypted payload that is not a signed JWS fell back to parsing the plaintext claims and returning them with no verifying key. oidcc_token:int_validate_jwt/4 then matched on the JOSE structure type rather than on whether a signature had been verified, and returned success. The JARM path in oidcc_token:validate_jarm/3 is reachable through the browser front channel. UserInfo responses are not affected, because OpenID Connect Core 1.0 section 5.3.2 permits them to be encrypted without also being signed.
This issue affects oidcc: from 3.2.0-beta.1 before 3.9.0.
Severity
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/erlef/oidcc/security/advisorie… | relatedvendor-advisory |
| https://cna.erlef.org/cves/CVE-2026-75759.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-75759 | related |
| https://github.com/erlef/oidcc/commit/5f62fbccdae… | patch |
Impacted products
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CVE-2026-74901 (GCVE-0-2026-74901)
Vulnerability from cvelistv5 – Published: 2026-08-17 11:04 – Updated: 2026-08-17 16:03
VLAI
EPSS
VEX
Title
openssl_encrypt before 1.4.0 Authentication Bypass via AES-CTR Fallback
Summary
openssl_encrypt versions before 1.4.0 contain an authentication bypass vulnerability in pqc.py where AES-GCM decryption failures trigger fallback to unauthenticated AES-CTR mode. Attackers can modify ciphertext in transit to bypass integrity verification and perform bit-flipping attacks without detection.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 16:00 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/jahlives/openssl_encrypt/secur… | vendor-advisory |
| https://www.vulncheck.com/advisories/openssl-encr… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jahlives | openssl_encrypt |
Affected:
0 , < 1.4.0
(semver)
Unaffected: 1.4.0 (semver) |
Date Public
2026-02-10 00:00
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CVE-2026-74876 (GCVE-0-2026-74876)
Vulnerability from cvelistv5 – Published: 2026-08-17 11:04 – Updated: 2026-08-17 15:42
VLAI
EPSS
VEX
Title
openssl_encrypt before 1.4.0 Unverified Key Bundle Encryption
Summary
openssl_encrypt versions before 1.4.0 contain a vulnerability in PublicKeyBundle.from_dict() that creates key bundles from untrusted data without verifying signatures. Attackers can call from_dict() followed by to_identity() without signature verification to encrypt data using attacker-controlled public keys, leaking secrets.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 15:41 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/jahlives/openssl_encrypt/secur… | vendor-advisory |
| https://www.vulncheck.com/advisories/openssl-encr… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jahlives | openssl_encrypt |
Affected:
0 , < 1.4.0
(semver)
Unaffected: 1.4.0 (semver) |
Date Public
2026-02-10 00:00
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CVE-2026-74244 (GCVE-0-2026-74244)
Vulnerability from cvelistv5 – Published: 2026-08-14 22:43 – Updated: 2026-08-17 18:02
VLAI
EPSS
VEX
Title
Quay: stripe webhook accepts forged events without signature verification in quay
Summary
A flaw was found in Red Hat Quay's Stripe billing webhook handler. This vulnerability allows an unauthenticated attacker to forge billing events by sending crafted JSON requests to the `/webhooks/stripe` endpoint without validating the Stripe-Signature header. Successful exploitation can lead to the unauthorized resetting of a namespace's build quota to its maximum and trigger unsolicited billing emails to namespace administrators.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 18:02 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-74244 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2516143 | issue-trackingx_refsource_REDHAT |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat OpenShift Update Service |
cpe:/a:redhat:openshift_update_service:5
|
|
| Red Hat | Red Hat Quay 3 |
cpe:/a:redhat:quay:3
|
Date Public
2026-08-14 00:00
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CVE-2026-72889 (GCVE-0-2026-72889)
Vulnerability from cvelistv5 – Published: 2026-08-19 07:20 – Updated: 2026-08-26 18:03
VLAI
EPSS
VEX
Title
Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify
Summary
Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify.
verify resolves the signature method class from the signature_method parameter of the incoming message. signature_method is required on every request, so the algorithm used to check a signature is chosen by whoever sent it, and nothing lets the verifying party pin the method instead. When a message names HMAC-SHA1 or HMAC-SHA256, the key is derived from consumer_secret and token_secret rather than from the key the provider deployed.
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Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 18:02 UTC
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/vurtdev/Net-OAuth/security/adv… | vendor-advisory |
| https://github.com/vurtdev/Net-OAuth/commit/c467a… | patch |
| https://metacpan.org/release/RRWO/Net-OAuth-0.33/… | release-notes |
| https://datatracker.ietf.org/doc/html/rfc5849#sec… | technical-description |
| https://datatracker.ietf.org/doc/html/rfc5849#sec… | technical-description |
| http://www.openwall.com/lists/oss-security/2026/08/19/2 |
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CVE-2026-72861 (GCVE-0-2026-72861)
Vulnerability from cvelistv5 – Published: 2026-08-20 19:48 – Updated: 2026-08-21 21:45
VLAI
EPSS
VEX
Title
Appwrite Templates github-issue-bot Skips Webhook Signature Verification When the X-Hub-Signature-256 Header Is Absent
Summary
The github-issue-bot templates in appwrite/templates verify the GitHub webhook signature with an inverted condition. verifyWebhook in node/github-issue-bot/src/github.js and in node-typescript/github-issue-bot/src/github.ts returns "typeof signature !== 'string' || (await verify(...))", so when the X-Hub-Signature-256 header is absent the first operand is true, the logical OR short-circuits, and the function reports success without performing any HMAC verification. main.js rejects a request only when verifyWebhook returns false, so an unauthenticated request carrying no signature passes the check. Processing then continues to postComment, which takes the repository and issue objects directly from the request body, letting the caller direct the deployed function to post a comment on a repository and issue of their choosing using the configured GITHUB_TOKEN, with the issue author login from the body interpolated into the comment text.
Severity
5.8 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 21:33 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/appwrite/templates/issues/350 | issue-tracking |
| https://github.com/appwrite/templates/blob/1.1.2/… | technical-description |
| https://github.com/appwrite/templates/blob/1.1.2/… | technical-description |
| https://github.com/appwrite/templates/blob/1.1.2/… | technical-description |
| https://github.com/appwrite/templates | product |
| https://www.vulncheck.com/advisories/appwrite-tem… | third-party-advisory |
Impacted products
Date Public
2026-05-26 00:00
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CVE-2026-68759 (GCVE-0-2026-68759)
Vulnerability from cvelistv5 – Published: 2026-08-12 15:15 – Updated: 2026-08-12 18:40
VLAI
EPSS
VEX
Title
Integration credential holders may impersonate users in JFrog Access
Summary
A holder of a valid integration credential may impersonate other users under specific conditions.
Severity
7.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 18:40 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://docs.jfrog.com/releases/docs/jfrog-securi… | vendor-advisory |
| https://docs.jfrog.com/releases/docs/artifactory-… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jfrog | artifactory |
Affected:
0 , < 7.146.35
(custom)
Affected: 7.161.0 , < 7.161.16 (custom) |
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CVE-2026-68757 (GCVE-0-2026-68757)
Vulnerability from cvelistv5 – Published: 2026-08-12 15:10 – Updated: 2026-08-12 19:01
VLAI
EPSS
VEX
Title
Potential improper SAML signature verification in JFrog Artifactory
Summary
A user with access to a valid SAML response may impersonate another user under specific conditions.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 19:01 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://docs.jfrog.com/releases/docs/jfrog-securi… | vendor-advisory |
| https://docs.jfrog.com/releases/docs/artifactory-… | vendor-advisory |
Impacted products
1 product
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|---|---|---|---|
| jfrog | artifactory |
Affected:
0 , < 7.146.35
(custom)
Affected: 7.161.0 , < 7.161.16 (custom) |
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CVE-2026-68745 (GCVE-0-2026-68745)
Vulnerability from cvelistv5 – Published: 2026-08-21 08:21 – Updated: 2026-08-24 16:58
VLAI
EPSS
VEX
Title
Apache CloudStack: SAML2 Signature Validation Silently Skipped for Cert-less IdP
Summary
Certificate validation failures in SAML authentication in Apache CloudStack 4.20.3.0 and 4.22.1.0 on all platforms allow a malicious agent to forge a SAML response to the management server. The agent will have to spoof the ip address of the IdP or get an url of its own choosing registered in the management server, after which it can allow logging on with forged signatures.
Users are recommended to upgrade to versions 4.20.3.1 or 4.22.1.1 and above, which fix this issue.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 16:58 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/g6cwddtjrwbh1d56w… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache CloudStack |
Affected:
4.5.2 , ≤ 4.20.3.0
(semver)
Affected: 4.21.0.0 , ≤ 4.22.1.0 (semver) |
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CVE-2026-66776 (GCVE-0-2026-66776)
Vulnerability from cvelistv5 – Published: 2026-08-11 00:19 – Updated: 2026-08-11 14:27
VLAI
EPSS
VEX
Title
Multiple vulnerabilities in SAP Business AI Platform (Approuter)
Summary
SAP Approuter does not consistently enforce integrity verification on certain session-related request headers under specific conditions. An attacker with low privileges could send a specially crafted request that bypasses the integrity check and loads another user's session context. Successful exploitation requires the attacker to have previously observed matching session values out-of-band, which makes the attack complex to execute. This could result in a high impact on confidentiality and a low impact on integrity. There is no impact on availability.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 13:16 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SAP_SE | SAP Business AI Platform (Approuter) |
Affected:
SAP Approuter node.js package < 23.0.0
|
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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.