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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-2026-54342 (GCVE-0-2026-54342)

Vulnerability from cvelistv5 – Published: 2026-07-24 18:26 – Updated: 2026-07-27 16:27
VLAI
Title
TLS Certificate Verification Disabled on CXF Transport Clients in epa4all
Summary
In epa4all, prior to version 2026-05-20, an attacker on the network path between epa4all and any backend (ePA Aktensystem, Konnektor, IDP, TSS) can present a self-signed TLS certificate and intercept the connection. For non-VAU connections (Konnektor, IDP), this allows direct read and modification of the inner traffic, including smartcard operations and OIDC authentication exchanges. For the ePA backend, the disabled TLS verification is the transport-level enabler for the VAU MITM described in GHSA-vvh7-x6c7-46gh. This issue has been patched in version 2026-05-20.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 16:26 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
med-united epa4all Affected: < 2026-05-20
Create a notification for this product.
Show details on NVD website

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CVE-2026-54323 (GCVE-0-2026-54323)

Vulnerability from cvelistv5 – Published: 2026-06-23 18:06 – Updated: 2026-06-24 14:27
VLAI
Title
Daytona: Git credential leak via git clone with TLS verification disabled
Summary
Daytona is a secure and elastic infrastructure runtime for AI-generated code execution and agent workflows. Prior to 0.185.0, the daemon's git clone implementation disabled TLS certificate verification. When a clone request carried Git credentials, the daemon sent the HTTP Basic Authorization header to the remote over a connection whose certificate was never validated, on both the go-git and native git CLI code paths. An attacker able to intercept clone traffic could present any TLS certificate, capture the Git credentials supplied for the clone, and serve tampered repository content into the sandbox. This vulnerability is fixed in 0.185.0.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-24 14:26 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
daytonaio daytona Affected: < 0.185.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-54100 (GCVE-0-2026-54100)

Vulnerability from cvelistv5 – Published: 2026-06-22 12:46 – Updated: 2026-09-09 12:05
VLAI
Title
Windows-machine-config-operator: windows-machine-config-operator: ssh host key not verified enables credential theft
Summary
A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. WMCO establishes SSH connections to Windows worker nodes without verifying the remote server host key. An adjacent-network attacker who can intercept or redirect WMCO's SSH session can capture WICD and kubelet bootstrap credentials transferred during node configuration, enabling compromise of Windows node identities in the cluster.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-22 00:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
Red Hat Red Hat OpenShift for Windows Containers 10.21 Unaffected: 1787065708 , < * (rpm)
    cpe:/a:redhat:windows_machine_config:10.21::el9
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Red Hat Red Hat OpenShift for Windows Containers 10.22 Unaffected: 1783692800 , < * (rpm)
    cpe:/a:redhat:windows_machine_config:10.22::el9
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
Create a notification for this product.
Date Public
2026-06-10 00:00
Show details on NVD website

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CVE-2026-53583 (GCVE-0-2026-53583)

Vulnerability from cvelistv5 – Published: 2026-08-20 18:39 – Updated: 2026-08-20 19:04
VLAI
Title
libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Backend
Summary
libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, verify_server_cert in src/libgit2/streams/openssl.c uses an inverted !!memcmp result in the GEN_IPADD branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 19:03 UTC
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
Impacted products
Vendor Product Version
libgit2 libgit2 Affected: < 1.8.6
Affected: >= 1.9.0, < 1.9.5
Create a notification for this product.
Show details on NVD website

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CVE-2026-53475 (GCVE-0-2026-53475)

Vulnerability from cvelistv5 – Published: 2026-06-10 13:55 – Updated: 2026-06-10 14:51
VLAI
Title
Assisted-migration-agent: tls verification disabled on all vcenter connections
Summary
A flaw was found in assisted-migration-agent. The application hardcodes insecure Transport Layer Security (TLS) connections when communicating with vCenter. This vulnerability allows a Man-in-the-Middle (MITM) attacker to intercept and harvest vCenter administrator credentials. This can lead to unauthorized access to vCenter.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-10 14:50 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
Affected: 0 , < b940fec9f5032a0801e994054d30e81d64b2942a (git)
Date Public
2026-06-07 00:00
Show details on NVD website

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CVE-2026-52723 (GCVE-0-2026-52723)

Vulnerability from cvelistv5 – Published: 2026-08-18 16:50 – Updated: 2026-08-18 17:38
VLAI
Title
ePA 3.x Integration: VAU Server Authentication Bypass via Circular Certificate Trust
Summary
ePA 3.x Integration implements the authorization workflow and writes Medical Information Objects to Germany's electronic patient record. Prior to 1.3.0, ePA 3.x Integration performs VAU server certificate validation in app/vau/VAUProtokoll.py without anchoring the signed_vau_server_pub_keys and AUT_VAU_CertData certificate path to independent trusted material. A network-positioned attacker between the DiGA backend and the ePA system can intercept the VAU handshake, supply attacker-controlled certificate and key material, and satisfy the circular trust relationship. Because TLS certificate verification is also disabled in affected versions, no independent server-authentication layer prevents the attack. The attacker can impersonate the VAU server, control the negotiated session keys, and read or modify all encrypted VAU traffic. This issue is fixed in version 1.3.0.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 17:38 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Show details on NVD website

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CVE-2026-50752 (GCVE-0-2026-50752)

Vulnerability from cvelistv5 – Published: 2026-06-08 11:00 – Updated: 2026-06-10 13:36
VLAI
Title
Certificate Validation Bypass in VPN Site-to-Site Connections Using IKEv1
Summary
A weakness in the certificate validation logic of the deprecated IKEv1 key exchange may allow an unauthenticated attacker positioned as a man-in-the-middle to bypass certificate validation in VPN site-to-site connections that use certificate-based authentication. Successful exploitation could allow interception or modification of traffic traversing the VPN tunnel.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-09 03:55 UTC
CWE
  • CWE-295 - Improper Certificate Validation.
References
Impacted products
Vendor Product Version
checkpoint Quantum Security Gateway Affected: R82.10 with Jumbo Hotfix Take 19 or below
Affected: R82 with Jumbo Hotfix Take 103 or below
Affected: R81.20 with Jumbo Hotfix Take 141 or below
Affected: R81.10, R81, and R80.40
Create a notification for this product.
checkpoint Spark Firewalls Affected: R80.20.X, R81.10.X, and R82.00.X
Create a notification for this product.
Show details on NVD website

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CVE-2026-50578 (GCVE-0-2026-50578)

Vulnerability from cvelistv5 – Published: 2026-08-18 16:51 – Updated: 2026-08-18 17:45
VLAI
Title
ePA 3.x Integration: TLS Certificate Verification Universally Disabled
Summary
ePA 3.x Integration implements the authorization workflow and writes Medical Information Objects to Germany's electronic patient record. Prior to 1.3.0, ePA 3.x Integration disables TLS certificate verification for both ePA connections in app/vau/VAUProtokoll.py and Konnektor connections in app/konnektor/Konnektor.py. A network-positioned attacker can present an arbitrary certificate, terminate the TLS connection, and intercept ePA traffic. The VAU protocol does not provide an effective fallback because its application-layer certificate validation is also broken in affected versions. The Konnektor session uses self.session.verify set to False while the client authenticates with self.session.cert, so an attacker impersonating the Konnektor can receive the client's mutual TLS certificate exchange and observe smartcard operations. This issue is fixed in version 1.3.0.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 17:44 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Show details on NVD website

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CVE-2026-50302 (GCVE-0-2026-50302)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:06 – Updated: 2026-09-09 19:37
VLAI
Title
Windows Cryptographic Services Security Feature Bypass Vulnerability
Summary
Improper certificate validation in Windows Cryptographic Services allows an unauthorized attacker to bypass a security feature over a network.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 13:05 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 21H2 Affected: 10.0.19044.0 , < 10.0.19044.7548 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 22H2 Affected: 10.0.19045.0 , < 10.0.19045.7548 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 24H2 Affected: 10.0.26100.0 , < 10.0.26100.8875 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 25H2 Affected: 10.0.26200.0 , < 10.0.26200.8875 (custom)
Create a notification for this product.
Microsoft Windows 11 version 26H1 Affected: 10.0.28000.0 , < 10.0.28000.2525 (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-2026-50149 (GCVE-0-2026-50149)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:16 – Updated: 2026-08-25 02:03
VLAI
Title
Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled
Summary
Contour is a Kubernetes ingress controller using Envoy proxy. In versions 1.23.0 through 1.33.4, when an `HTTPProxy` is configured with incompatible combination of both `.spec.virtualhost.tls.enableFallbackCertificate: true` and `.spec.virtualhost.jwtProviders`, Contour does not reject the configuration. Consequently, requests from clients that do not send TLS SNI or send an unrecognized SNI (one that does not match any `HTTPProxy` FQDN) bypass configured JWT verification and are proxied to upstream services without a valid token. This issue is fixed in Contour v1.33.5. Contour now rejects and marks invalid any `HTTPProxy` resources that combine `.spec.virtualhost.tls.enableFallbackCertificate: true` with `.spec.virtualhost.jwtProviders`. Affected resources will receive a status condition with the error reason `TLSIncompatibleFeatures`. As a workaround, do not enable `.spec.virtualhost.tls.enableFallbackCertificate` on `HTTPProxy` resources that also define `.spec.virtualhost.jwtProviders`. Remove one of the two settings to avoid the invalid configuration.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 02:03 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
projectcontour contour Affected: >= 1.23.0, < 1.33.5
Create a notification for this product.
Show details on NVD website

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              "description": "CWE-295: Improper Certificate Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T14:16:21.476Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/projectcontour/contour/security/advisories/GHSA-g3xr-5w5j-w4q4"
        }
      ],
      "source": {
        "advisory": "GHSA-g3xr-5w5j-w4q4",
        "discovery": "UNKNOWN"
      },
      "title": "Contour has Improper JWT Verification for Non-SNI Requests on Virtual Hosts with Fallback Certificate Enabled"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-50149",
    "datePublished": "2026-08-19T14:16:21.476Z",
    "dateReserved": "2026-06-03T20:54:20.431Z",
    "dateUpdated": "2026-08-25T02:03:11.629Z",
    "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.