Common Weakness Enumeration
CWE-295
AllowedImproper Certificate Validation
Abstraction: Base · Status: Draft
The product does not validate, or incorrectly validates, a certificate.
1952 vulnerabilities reference this CWE, most recent first.
CVE-2026-69248 (GCVE-0-2026-69248)
Vulnerability from cvelistv5 – Published: 2026-08-03 21:21 – Updated: 2026-08-03 21:21
VLAI
EPSS
VEX
Title
python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees
Summary
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 49.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of *.example.com, python-cryptography's verifier accepts which allows escaping outside of the permitted names. The core issue is in DNSConstraint::matches, where a wildcard pattern was treated as matching a more-specific permitted constraint even though *.example.com can expand to sibling names such as bar.example.com outside foo.example.com. This allows acceptance of an invalid certificate chain. This issue is fixed in 49.0.0.
Severity
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pyca/cryptography/security/adv… | x_refsource_CONFIRM |
| https://github.com/pyca/cryptography/pull/14888 | x_refsource_MISC |
| https://github.com/pyca/cryptography/commit/4d035… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| pyca | cryptography |
Affected:
< 49.0.0
|
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CVE-2026-67598 (GCVE-0-2026-67598)
Vulnerability from cvelistv5 – Published: 2026-08-03 19:02 – Updated: 2026-08-03 19:02 X_Open Source
VLAI
EPSS
VEX
Title
Emlog Pro 2.6.23 TLS Certificate Validation Disabled in ai.php
Summary
Emlog Pro through 2.6.23 contains a disabled TLS certificate validation vulnerability in include/service/ai.php that allows network-adjacent attackers to intercept outbound HTTPS requests to configured LLM providers by presenting arbitrary TLS certificates, as CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST are unconditionally disabled across sendStream(), sendImageRequest(), send(), and fetchSearchHtml() with no option to re-enable verification. Attackers can perform man-in-the-middle interception to extract Authorization Bearer API keys from every AI request and inject crafted AI responses that may be acted upon by the tool-call execution pipeline, including the query_database and update_config tool handlers.
Severity
7.4 (High)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/emlog/emlog/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/emlog-pro-tl… | third-party-advisory |
Date Public
2026-08-03 00:00
Credits
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CVE-2026-67294 (GCVE-0-2026-67294)
Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 18:15
VLAI
EPSS
VEX
Title
FreeRDP before 3.29.0 TLS Certificate EKU Bypass
Summary
FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.
Severity
5.9 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/FreeRDP/FreeRDP/security/advis… | vendor-advisory |
| https://github.com/FreeRDP/FreeRDP/commit/f3b4347… | patch |
| https://www.vulncheck.com/advisories/freerdp-befo… | third-party-advisory |
Impacted products
Date Public
2026-07-15 00:00
Credits
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CVE-2026-67293 (GCVE-0-2026-67293)
Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 19:46
VLAI
EPSS
VEX
Title
FreeRDP before 3.29.0 Improper Certificate Hostname Validation
Summary
FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability. The TLS hostname matcher (tls_match_hostname() in libfreerdp/crypto/tls.c) treats a wildcard pattern such as *.example.com as matching any hostname ending in .example.com, so it incorrectly accepts a wildcard certificate for multi-label subdomains like a.b.example.com (which OpenSSL's X509_check_host() rejects). This weakens TLS server authentication under wildcard-certificate conditions.
Severity
4.2 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/FreeRDP/FreeRDP/security/advis… | vendor-advisory |
| https://github.com/FreeRDP/FreeRDP/commit/f3b4347… | patch |
| https://www.vulncheck.com/advisories/freerdp-befo… | third-party-advisory |
Impacted products
Date Public
2026-07-15 00:00
Credits
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CVE-2026-66402 (GCVE-0-2026-66402)
Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 18:30
VLAI
EPSS
VEX
Title
FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
Summary
FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certificate identity validation weaknesses in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). Because FreeRDP performs custom Common Name and DNS SAN string matching instead of using OpenSSL's length-aware identity validation APIs, it (1) truncates DNS SAN values at embedded NUL bytes (accepting e.g. 'victim.example\0.attacker.example' as 'victim.example'), (2) accepts a matching Common Name even when non-matching DNS SAN entries are present, and (3) accepts IP-literal targets via DNS/CN matching without comparing iPAddress SANs. Under a trusted or misissued certificate chain, an attacker positioned to present such a certificate can bypass server identity verification, weakening TLS server authentication.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/FreeRDP/FreeRDP/security/advis… | vendor-advisory |
| https://github.com/FreeRDP/FreeRDP/commit/b9533f0… | patch |
| https://www.vulncheck.com/advisories/freerdp-befo… | third-party-advisory |
Impacted products
Date Public
2026-07-15 00:00
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CVE-2026-65325 (GCVE-0-2026-65325)
Vulnerability from cvelistv5 – Published: 2026-07-29 08:23 – Updated: 2026-07-29 12:19
VLAI
EPSS
VEX
Title
Apache Traffic Server: HTTP/2 multiplexed origin sessions are reused without certificate re-verification
Summary
Apache Traffic Server reuses multiplexed HTTP/2 origin connections without verifying the server certificate covers the new request hostname.
This issue affects Apache Traffic Server: from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/5prl9glcm9g2swnq9… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
9.0.0 , ≤ 9.2.14
(semver)
Affected: 10.0.0 , ≤ 10.1.3 (semver) |
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CVE-2026-59836 (GCVE-0-2026-59836)
Vulnerability from cvelistv5 – Published: 2026-07-14 15:15 – Updated: 2026-07-15 03:59
VLAI
EPSS
VEX
Summary
A improper certificate validation vulnerability in Fortinet FortiClientEMS 7.4.3 through 7.4.5, FortiClientEMS 7.4.0 through 7.4.1, FortiClientEMS 7.2 all versions may allow attacker to information disclosure via <insert attack vector here>
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Information disclosure
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Fortinet | FortiClientEMS |
Affected:
7.4.3 , ≤ 7.4.5
(semver)
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CVE-2026-59818 (GCVE-0-2026-59818)
Vulnerability from cvelistv5 – Published: 2026-07-08 21:00 – Updated: 2026-07-09 13:13
VLAI
EPSS
VEX
Title
etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation
Summary
etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/etcd-io/etcd/security/advisori… | x_refsource_CONFIRM |
| https://github.com/etcd-io/etcd/pull/22007 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/pull/22021 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/pull/22025 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/commit/2308ce1578… | x_refsource_MISC |
| https://github.com/etcd-io/etcd/commit/24838af5a5… | x_refsource_MISC |
| https://github.com/etcd-io/etcd/commit/8221ae82bc… | x_refsource_MISC |
| https://github.com/etcd-io/etcd/releases/tag/v3.5.32 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/releases/tag/v3.6.13 | x_refsource_MISC |
Impacted products
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CVE-2026-58162 (GCVE-0-2026-58162)
Vulnerability from cvelistv5 – Published: 2026-07-29 08:36 – Updated: 2026-07-29 13:41
VLAI
EPSS
VEX
Title
Apache Traffic Server: Certifier plugin trusts client SNI when generating certificates
Summary
The Apache Traffic Server certifier plugin generates certificates based on attacker-controlled client SNI.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/5prl9glcm9g2swnq9… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
8.0.0 , ≤ 8.1.9
(semver)
Affected: 9.0.0 , ≤ 9.2.14 (semver) Affected: 10.0.0 , ≤ 10.1.3 (semver) |
Credits
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CVE-2026-58062 (GCVE-0-2026-58062)
Vulnerability from cvelistv5 – Published: 2026-08-03 02:35 – Updated: 2026-08-03 18:27
VLAI
EPSS
VEX
Title
Stapled OCSP response accepted without binding to the checked certificate
Summary
In Bouncy Castle for Java before 1.85, Stapled OCSP response accepted without binding to the checked certificate. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 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 (v2.0.3)
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/add5f8226… | patch |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA |
Affected:
1.66 , < 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:
2.0.0 , < 2.0.2
(maven)
Affected: 2.1.0 , < 2.1.3 (maven) |
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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.