Common Weakness Enumeration
CWE-295
AllowedImproper Certificate Validation
Abstraction: Base · Status: Draft
The product does not validate, or incorrectly validates, a certificate.
2138 vulnerabilities reference this CWE, most recent first.
CVE-2026-9259 (GCVE-0-2026-9259)
Vulnerability from cvelistv5 – Published: 2026-06-15 23:36 – Updated: 2026-06-16 12:43
VLAI
EPSS
VEX
Summary
Improper validation of server certificates in Canon EOS Network Setting Tool Version 1.5.0 or earlier
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 12:43 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://psirt.canon/advisory-information/cp2026-005/ | vendor-advisory |
| https://canon.jp/support/support-info/260615vulne… | vendor-advisory |
| https://www.usa.canon.com/about-us/to-our-custome… | vendor-advisory |
| https://www.canon-europe.com/support/product-security/ | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Canon Inc. | EOS Network Setting Tool for Windows |
Affected:
1.5.0 or earlier
|
|
| Canon Inc. | EOS Network Setting Tool for macOS |
Affected:
1.5.0 or earlier
|
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CVE-2026-9258 (GCVE-0-2026-9258)
Vulnerability from cvelistv5 – Published: 2026-06-15 23:35 – Updated: 2026-06-16 12:47
VLAI
EPSS
VEX
Summary
Improper validation of SSH host keys in Canon EOS Network Setting Tool Version 1.5.0 or earlier
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 12:47 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://psirt.canon/advisory-information/cp2026-005/ | vendor-advisory |
| https://canon.jp/support/support-info/260615vulne… | vendor-advisory |
| https://www.usa.canon.com/about-us/to-our-custome… | vendor-advisory |
| https://www.canon-europe.com/support/product-security/ | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Canon Inc. | EOS Network Setting Tool for Windows |
Affected:
1.5.0 or earlier
|
|
| Canon Inc. | EOS Network Setting Tool for macOS |
Affected:
1.5.0 or earlier
|
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CVE-2026-9058 (GCVE-0-2026-9058)
Vulnerability from cvelistv5 – Published: 2026-05-25 13:23 – Updated: 2026-07-23 12:00
VLAI
EPSS
VEX
Title
Improper Certificate Verification in Szafir SDK
Summary
For untrusted certificates that contain the "Authority Information Access - caIssuers URI" extension, Szafir SDK will automatically download the parent CA certificate from the specified URL and will import it to its trust store as a "nonqualified" certificate. In such a case, Szafir SDK returns a success status code of 0 ("Positively verified") upon successful cryptographic verification and a certificate status of "nonqualified".
For other types of untrusted certificates, Szafir SDK returns a success status code of 0 ("Positively verified") upon successful cryptographic verification and a certificate status of "nondetermined".
This may lead integrating applications to incorrectly treat the digital signature as valid despite an untrusted certificate chain. This flaw enables authentication bypass and user impersonation:
(1) in use-cases other than qualified certificate authentication, or
(2) if the qualified certificate authentication use-case is not correctly implemented by the integrating application.
This issue was fixed in version 1.8.463.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 15:57 UTC
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://cert.pl/posts/2026/05/CVE-2026-9058 | third-party-advisory |
| https://www.elektronicznypodpis.pl/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Krajowa Izba Rozliczeniowa | Szafir SDK |
Affected:
0 , < 1.8.463.2
(semver)
|
Date Public
2026-05-25 06:12
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CVE-2026-9036 (GCVE-0-2026-9036)
Vulnerability from cvelistv5 – Published: 2026-09-03 20:42 – Updated: 2026-09-10 21:00
VLAI
EPSS
VEX
Title
Vulnerabilities exists in IBM Netezza Software
Summary
IBM Netezza Software 11.3.0.3 through Interim Fix 002 does not validate or improperly validates TLS certificate validation, which could allow an attacker to obtain sensitive information using man in the middle techniques.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 20:38 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7284359 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Netezza Software |
Affected:
11.3.0.3 , ≤ Interim Fix 002
(semver)
cpe:2.3:a:ibm:netezza_software:11.3.0.3:*:*:*:*:*:*:* cpe:2.3:a:ibm:netezza_software:interim:interim_fix_002:*:*:*:*:*:* |
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CVE-2026-8992 (GCVE-0-2026-8992)
Vulnerability from cvelistv5 – Published: 2026-05-22 14:24 – Updated: 2026-05-23 03:55
VLAI
EPSS
VEX
Summary
An improper certificate validation vulnerability in Ivanti Secure Access Client before 22.8R6 allows a remote unauthenticated attacker to execute arbitrary code.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-22 00:00 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ivanti | Secure Access Client |
Unaffected:
22.8R6
|
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CVE-2026-8763 (GCVE-0-2026-8763)
Vulnerability from cvelistv5 – Published: 2026-08-03 00:36 – Updated: 2026-08-03 13:29
VLAI
EPSS
VEX
Title
Name Constraints bypass via trailing dot in rfc822Name and URI
Summary
In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 13:29 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9… | vendor-advisory |
| https://github.com/bcgit/bc-java/commit/2c28b253a… | patch |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA |
Affected:
0 , < 1.85
(maven)
|
|
| Legion of the Bouncy Castle Inc. | BC-LTS-JAVA |
Affected:
2.73.0 , < 2.73.12
(maven)
|
|
| Legion of the Bouncy Castle Inc. | BC-FJA |
Affected:
1.0.0 , < 1.0.2.7
(maven)
Affected: 2.0.0 , < 2.0.2 (maven) Affected: 2.1.0 , < 2.1.3 (maven) |
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CVE-2026-8497 (GCVE-0-2026-8497)
Vulnerability from cvelistv5 – Published: 2026-07-29 17:24 – Updated: 2026-07-29 18:14
VLAI
EPSS
VEX
Summary
Improper certificate validation in the Devolutions Server connection handling in Devolutions Password Manager 2026.2.1.0 and earlier on Android, iOS, and macOS allows an adjacent-network attacker to intercept and modify sensitive information via a forged TLS certificate.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 18:13 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Devolutions | Password Manager |
Affected:
0 , < 2026.2.2
(custom)
|
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CVE-2026-8480 (GCVE-0-2026-8480)
Vulnerability from cvelistv5 – Published: 2026-07-01 14:52 – Updated: 2026-07-01 15:45
VLAI
EPSS
VEX
Title
Connection possible to the Administration portal with a revoked certificate
Summary
A vulnerability was discovered on Stormshield Network Security 4.3.0 to 4.3.41 (included), 4.4.0 to 4.8.15 (included) , 5.0.2 EA to 5.0.5 (included)
A revoked client certificate can still be used to authenticate to the captive‑admin portal, allowing an attacker who possesses the revoked certificate to gain administrative access.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 15:44 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Stormshield | Stormshield Network Security |
Affected:
4.3.0 , ≤ 4.3.41
(semver)
Affected: 4.4.0 , ≤ 4.8.15 (semver) Affected: 5.0.2 EA , ≤ 5.0.5 (semver) |
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CVE-2026-8367 (GCVE-0-2026-8367)
Vulnerability from cvelistv5 – Published: 2026-05-13 14:55 – Updated: 2026-05-13 18:35
VLAI
EPSS
VEX
Title
aria2c Improper Certificate Validation
Summary
aria2c accepts a server certificate with incorrect Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 18:34 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| aria2_project | aria2c |
Affected:
0 , ≤ 1.37.0
(semver)
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CVE-2026-8286 (GCVE-0-2026-8286)
Vulnerability from cvelistv5 – Published: 2026-07-03 06:14 – Updated: 2026-09-15 06:03
VLAI
EPSS
VEX
Title
wrong STARTTLS connection reuse
Summary
A vulnerability exists where a new transfer that uses STARTTLS to upgrade the
connection might reuse an existing live connection even though the TLS
configuration mismatches so it should not.
Severity
8.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 17:33 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| curl | curl |
Affected:
7.30.0 , < 8.14.2
(semver)
Affected: 8.15.0 , < 8.16.1 (semver) Affected: 8.17.0 , < 8.20.1 (semver) |
|
| curl | curl |
Affected:
a1701eea289fe7ea80651f801cf992838a491dde , < a86efdd7ca5433de9231e650f18247de8319ad16
(git)
|
|
| curl | curl |
Affected:
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"cweId": "CWE-295",
"description": "Improper Certificate Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-15T06:03:17.789Z",
"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"shortName": "curl"
},
"references": [
{
"url": "https://curl.se/docs/CVE-2026-8286.json"
},
{
"url": "https://curl.se/docs/CVE-2026-8286.html"
},
{
"url": "https://hackerone.com/reports/3718195"
}
],
"title": "wrong STARTTLS connection reuse",
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_osv": {
"affected": [
{
"ranges": [
{
"events": [
{
"introduced": "7.30.0"
},
{
"fixed": "8.14.2"
},
{
"introduced": "8.15.0"
},
{
"fixed": "8.16.1"
},
{
"introduced": "8.17.0"
},
{
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}
],
"type": "SEMVER"
},
{
"events": [
{
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},
{
"fixed": "a86efdd7ca5433de9231e650f18247de8319ad16"
}
],
"repo": "https://github.com/curl/curl.git",
"type": "GIT"
}
],
"versions": [
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}
],
"aliases": [
"CVE-2026-8286"
],
"credits": [
{
"name": "Andrew Nesbitt (powered by Mythos)",
"type": "finder"
},
{
"name": "Stefan Eissing",
"type": "remediation developer"
}
],
"database_specific": {
"CWE": {
"desc": "Improper Certificate Validation",
"id": "CWE-295"
},
"URL": "https://curl.se/docs/CVE-2026-8286.json",
"affects": "both",
"issue": "https://hackerone.com/reports/3718195",
"last_affected": "8.20.0",
"package": "curl",
"severity": "Low",
"www": "https://curl.se/docs/CVE-2026-8286.html"
},
"details": "A vulnerability exists where a new transfer that uses STARTTLS to upgrade the\nconnection might reuse an existing live connection even though the TLS\nconfiguration mismatches so it should not.",
"id": "CURL-CVE-2026-8286",
"modified": "2026-09-07T10:34:51.00Z",
"published": "2026-06-24T08:00:00.00Z",
"schema_version": "1.5.0",
"summary": "wrong STARTTLS connection reuse"
}
}
},
"cveMetadata": {
"assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
"assignerShortName": "curl",
"cveId": "CVE-2026-8286",
"datePublished": "2026-07-03T06:14:17.541Z",
"dateReserved": "2026-05-11T07:06:37.906Z",
"dateUpdated": "2026-09-15T06:03:17.789Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation
Architecture and Design
Implementation
Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Mitigation
Implementation
If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
CAPEC-459: Creating a Rogue Certification Authority Certificate
An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.
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.