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Common Weakness Enumeration

CWE-295

Allowed

Improper Certificate Validation

Abstraction: Base · Status: Draft

The product does not validate, or incorrectly validates, a certificate.

2121 vulnerabilities reference this CWE, most recent first.

CVE-2026-56820 (GCVE-0-2026-56820)

Vulnerability from cvelistv5 – Published: 2026-07-21 22:26 – Updated: 2026-07-24 20:12
VLAI
Title
Netty: Missing CertificateID Validation in OCSP Response Allows Replay Attacks
Summary
Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and prior to 4.1.135.Final, `OcspClient` does not validate that the `CertificateID` in an OCSP response matches the requested `CertificateID`, which can lead to replay attack. `OcspClient.validateResponse` accepts a legitimately signed `GOOD` status response for an unrelated certificate issued by the same CA, allowing bypass of revocation checks for another certificate. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-24 03:55 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
netty netty Affected: >= 4.2.0.Final, < 4.2.16.Final
Affected: < 4.1.136.Final
Create a notification for this product.
Show details on NVD website

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CVE-2026-56624 (GCVE-0-2026-56624)

Vulnerability from cvelistv5 – Published: 2026-07-20 20:28 – Updated: 2026-07-23 03:56
VLAI
Title
Apache MINA SSHD: SSH certificate options lack validations
Summary
Improper certificate validation in Apache MINA SSHD (server-side). Apache MINA SSHD is a Java library for client-side and server-side SSH. Server-side OpenSSH user certificate validation during user authentication in an Apache MINA SSHD server did not check for the unsupported force-command or verify-required options that could be embedded in the certificate, nor did it validate these options. As a result it was possible that a user could authenticate with such a certificate that included a force-command option but still was able to execute other commands. What other command exactly would be available to the user depends on the implementation of the server. This issue is fixed in Apache MINA SSHD 2.19.0 and 3.0.0-M5. Applications are advised to upgrade to these versions. The fix rejects OpenSSH user certificates that include these options, since Apache MINA SSHD implements neither force-command nor sk-*-cert-v01@openssh.com user certificates (which are the only ones for which verify-required would make sense).
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 00:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
Apache Software Foundation Apache MINA SSHD Affected: 2.0.0 , ≤ 2.18.0 (maven)
Affected: 3.0.0-M1 , ≤ 3.0.0-M4 (maven)
Create a notification for this product.
Show details on NVD website

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CVE-2026-55964 (GCVE-0-2026-55964)

Vulnerability from cvelistv5 – Published: 2026-06-25 19:30 – Updated: 2026-06-26 13:57
VLAI
Title
Chain intermediate CA:TRUE without keyCertSign accepted as a signing CA (temporary CA exemption)
Summary
Chain intermediate CA:TRUE without keyCertSign accepted as a signing CA. Intermediate CA certificates are required to have the keyCertSign key usage when a Key Usage extension is present, but chain-supplied temporary CAs (WOLFSSL_TEMP_CA) added while building a certificate path were previously exempted from this check, so an intermediate asserting CA:TRUE but lacking keyCertSign was accepted as a signing CA. The check now applies to chain-supplied temporary CAs as well; only operator-loaded root certificates (WOLFSSL_USER_CA) and self-signed roots remain exempt. Per RFC 5280 an absent Key Usage extension implies all usages, so the requirement is enforced only when the extension is actually present (extKeyUsageSet). Affects the OpenSSL-compatibility certificate-path-building path (X509_verify_cert / X509_STORE, OPENSSL_EXTRA/OPENSSL_ALL), where untrusted chain intermediates are added as temporary CAs; native (non-OpenSSL-compat) certificate verification does not create temporary CAs and is unaffected. Within those builds, the check applies unless ALLOW_INVALID_CERTSIGN is defined.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 13:56 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
wolfSSL wolfSSL Affected: 5.7.4 , ≤ 5.9.1 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-55960 (GCVE-0-2026-55960)

Vulnerability from cvelistv5 – Published: 2026-06-25 19:31 – Updated: 2026-06-26 13:58
VLAI
Title
Un-negotiated Raw Public Key (RFC 7250) accepted in place of X.509, bypassing chain validation
Summary
Un-negotiated Raw Public Key (RFC 7250) accepted in place of an X.509 certificate, bypassing chain validation. A raw public key has no chain, so ParseCertRelative() accepts it without performing any trust verification; it must therefore only be accepted when RPK was actually negotiated for that peer. The check now defaults the expected type to X.509 (per RFC 7250/8446) when no type was negotiated, comparing against the received server certificate type on the client and the selected client certificate type on the server, and rejects any mismatch, including an un-negotiated raw public key, with UNSUPPORTED_CERTIFICATE. Only affects builds with Raw Public Key support (HAVE_RPK) enabled - disabled by default in a standalone build, but included in --enable-all.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 13:58 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
wolfSSL wolfSSL Affected: 5.6.4 , ≤ 5.9.1 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-55436 (GCVE-0-2026-55436)

Vulnerability from cvelistv5 – Published: 2026-07-08 00:26 – Updated: 2026-07-08 13:11
VLAI
Title
Coder's AI Bridge Proxy skips TLS certificate verification in default configuration
Summary
Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.30.0 and prior to versions 2.32.7, 2.33.8, and 2.34.2, the AI Bridge Proxy (`aibridgeproxyd`) created a goproxy server whose default transport set `InsecureSkipVerify: true` and only assigned a secure transport when an upstream proxy was configured. In the default configuration (no upstream proxy), outbound HTTPS to the Coder access URL accepted any TLS certificate. Practical exploitation requires an on-path (man-in-the-middle) position between the AI Bridge Proxy and the Coder server. Deployments where they are co-located over loopback are effectively unaffected. The fix in versions 2.32.7, 2.33.8, and 2.34.2 applies the secure transport (TLS 1.2 or higher using system root CAs) unconditionally. As a workaround, ensure the Coder access URL uses a trusted certificate and secure the network path between the AI Bridge Proxy and the Coder server (for example, loopback or mTLS).
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 13:11 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
coder coder Affected: >= 2.34.0, < 2.34.2
Affected: >= 2.33.0, < 2.33.8
Affected: >= 2.30.0, < 2.32.7
Create a notification for this product.
Show details on NVD website

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CVE-2026-55215 (GCVE-0-2026-55215)

Vulnerability from cvelistv5 – Published: 2026-08-28 19:02 – Updated: 2026-09-01 01:56
VLAI
Title
MariaDB Connector/Node.js: Connector leaks the cleartext password to an MitM despite `ssl: true`
Summary
MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to versions 3.3.3, 3.4.6, and 3.5.3, when ssl is enabled without a pinned CA or server certificate, MariaDB Connector/Node.js sends credentials before completing certificate fingerprint validation. In lib/cmd/handshake/auth/handshake.js, a server that selects mysql_clear_password as the initial authentication plugin can receive the password before the post-TLS identity check. In lib/cmd/handshake/authentication.js, an authentication switch can evaluate the previous plugin instead of the requested target plugin, allowing mysql_clear_password to send the credential first. An active man-in-the-middle can present a self-signed certificate, capture the database password, and use it to authenticate directly even though the connector later rejects the server and closes the connection. This issue is fixed in versions 3.3.3, 3.4.6, and 3.5.3.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 01:56 UTC
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-522 - Insufficiently Protected Credentials
Impacted products
Show details on NVD website

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CVE-2026-55001 (GCVE-0-2026-55001)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:04 – Updated: 2026-09-09 19:35
VLAI
Title
Active Directory Domain Services Elevation of Privilege Vulnerability
Summary
Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 03:57 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1607 Affected: 10.0.14393.0 , < 10.0.14393.9339 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 1809 Affected: 10.0.17763.0 , < 10.0.17763.9020 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 Affected: 10.0.14393.0 , < 10.0.14393.9339 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.14393.0 , < 10.0.14393.9339 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 Affected: 10.0.17763.0 , < 10.0.17763.9020 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.17763.0 , < 10.0.17763.9020 (custom)
Create a notification for this product.
Microsoft Windows Server 2022 Affected: 10.0.20348.0 , < 10.0.20348.5386 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 Affected: 10.0.26100.0 , < 10.0.26100.33158 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 (Server Core installation) Affected: 10.0.26100.0 , < 10.0.26100.33158 (custom)
Create a notification for this product.
Date Public
2026-07-14 14:00
Show details on NVD website

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CVE-2026-54919 (GCVE-0-2026-54919)

Vulnerability from cvelistv5 – Published: 2026-07-10 16:06 – Updated: 2026-07-14 03:55
VLAI
Title
cpp-httplib: TLS certificate chain verification bypassed for IP-literal hosts on Mbed TLS and wolfSSL backends
Summary
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend versions from 0.31.0 through 0.46.1 and wolfSSL backend versions from 0.33.0 through 0.46.1, when cpp-httplib is built with CPPHTTPLIB_MBEDTLS_SUPPORT or CPPHTTPLIB_WOLFSSL_SUPPORT and a client connects to an IP-literal host with server certificate verification enabled, SSLClient and Client in HTTPS mode skip certificate chain validation and WebSocketClient on the Mbed TLS backend skips verification altogether, allowing a man-in-the-middle attacker positioned to intercept traffic to present a crafted certificate and read or modify the traffic. This issue is fixed in version 0.47.0.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 00:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
yhirose cpp-httplib Affected: >= 0.31.0, < 0.47.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-54548 (GCVE-0-2026-54548)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:17 – Updated: 2026-08-26 15:36
VLAI
Title
kas: Persistent SSH Host Key Checking Disablement
Summary
kas is a setup tool for bitbake based projects. Prior to 5.4, internal SSH key setup triggered by SSH_PRIVATE_KEY or SSH_PRIVATE_KEY_FILE creates ~/.ssh/config when no user-specific SSH configuration exists and adds a global Host * rule containing StrictHostKeyChecking no. In kas/libcmds.py, ssh_no_host_key_check() runs without checking ctx.managed_env, so the setting persists after kas exits and affects future SSH sessions by the same local user, extending beyond the intended short-lived continuous integration environment. A later SSH connection can therefore accept an attacker-controlled host key without verification, increasing the risk of a man-in-the-middle attack that compromises session confidentiality or integrity. This issue is fixed in version 5.4.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 15:34 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
siemens kas Affected: < 5.4
Create a notification for this product.
Show details on NVD website

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CVE-2026-54481 (GCVE-0-2026-54481)

Vulnerability from cvelistv5 – Published: 2026-08-13 16:44 – Updated: 2026-08-14 17:44
VLAI
Title
Internal API HTTP client hardcodes InsecureSkipVerify:true with no config override (CWE-295)
Summary
Internal API HTTP client hardcodes InsecureSkipVerify:true with no config override (CWE-295)
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 17:44 UTC
CWE
Impacted products
Vendor Product Version
Gitea Gitea Open Source Git Server Affected: 0 , ≤ 1.26.4 (semver)
Create a notification for this product.
Credits
Show details on NVD website

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          "url": "https://blog.gitea.com/gitea-1.27.0-is-released/"
        }
      ],
      "title": "Internal API HTTP client hardcodes InsecureSkipVerify:true with no config override (CWE-295)",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
    "assignerShortName": "Gitea",
    "cveId": "CVE-2026-54481",
    "datePublished": "2026-08-13T16:44:39.761Z",
    "dateReserved": "2026-07-08T09:19:08.760Z",
    "dateUpdated": "2026-08-14T17:44:39.896Z",
    "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.