Common Weakness Enumeration

CWE-295

Allowed

Improper Certificate Validation

Abstraction: Base · Status: Draft

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

2039 vulnerabilities reference this CWE, most recent first.

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: 2026-08-31 15:26
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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CVE-2026-49457 (GCVE-0-2026-49457)

Vulnerability from cvelistv5 – Published: 2026-08-14 18:27 – Updated: 2026-08-14 19:30
VLAI
Title
QUIC has Broken TLS verification
Summary
erlang_quic is a pure Erlang QUIC implementation. Prior to version 1.4.4, the QUIC client did not authenticate the server during the TLS 1.3 handshake. The CertificateVerify signature was not checked, the certificate chain was not validated, and the hostname was not compared against the certificate, so `verify` was effectively a no-op on the client. A man-in-the-middle on the network path could present any certificate and impersonate any server, defeating the confidentiality and integrity of the connection. HTTP/3 uses the same client and was equally affected. Handshakes authenticated by a PSK (session resumption) are not affected, because the peer is authenticated by the PSK binder and no certificate is sent. This is fixed in 1.4.4. The client now verifies the CertificateVerify signature, validates the certificate chain against the trust store (`cacerts` option, the operating system store by default), and checks the hostname. Client `verify` now defaults to on; set `verify => false` to accept any certificate (for example a self-signed test server). No known workarounds are available before 1.4.4. `verify => true` had no effect, and inspecting the certificate after connecting does not help because without the signature check the peer is never proven to own the certificate it presents.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 19:29 UTC
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-297 - Improper Validation of Certificate with Host Mismatch
References
Impacted products
Vendor Product Version
benoitc erlang_quic Affected: < 1.4.4
Create a notification for this product.
Show details on NVD website

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CVE-2026-49283 (GCVE-0-2026-49283)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:47 – Updated: 2026-08-19 18:19
VLAI
Title
SimpleSAMLphp HTTP-Artifact TLS validator confusion allows cross-IdP authentication bypass
Summary
The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator() attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a validator that delegates to the outer message and is later checked against metadata selected from the embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns normally when the TLS public key does not match the key being validated, and SAML2\Message::validate() treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 18:16 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
simplesamlphp saml2 Affected: < 4.19.3
Affected: >= 4.20.0, < 4.20.2
Affected: >= 5.0.0, < 5.0.6
Affected: >= 6.0.0, < 6.2.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-49267 (GCVE-0-2026-49267)

Vulnerability from cvelistv5 – Published: 2026-06-01 07:53 – Updated: 2026-06-02 16:42
VLAI
Title
Apache Airflow: No certificate validation on SMTP STARTTLS connections
Summary
Apache Airflow's EmailOperator and the underlying `airflow.utils.email` helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used `[email] smtp_starttls=True` without `[email] smtp_ssl`. An attacker positioned between the worker and the configured SMTP server (network MITM — typical hostile-network attack-surface for environments where the SMTP relay sits outside the worker's trust boundary) could present a self-signed certificate, have the worker complete the STARTTLS handshake silently, and capture the SMTP AUTH credentials and message contents the worker forwarded. This CVE covers the **core apache-airflow side** of the same root cause already covered for the SMTP provider by `CVE-2026-41016` (published 2026-04-27, covering `apache-airflow-providers-smtp`). Users who already applied the SMTP-provider fix from CVE-2026-41016 should additionally upgrade `apache-airflow` to 3.2.2 or later to cover the core-side path through `airflow.utils.email`. Affects deployments configured with `smtp_starttls=True` and `smtp_ssl=False` where the SMTP relay is reachable across a less-trusted network segment than the worker. Users are advised to upgrade to `apache-airflow` 3.2.2 or later.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-02 16:20 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
Apache Software Foundation Apache Airflow Affected: 2.0.0 , < 3.2.2 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-48437 (GCVE-0-2026-48437)

Vulnerability from cvelistv5 – Published: 2026-08-11 16:59 – Updated: 2026-08-27 22:34
VLAI
Title
CAI Content Credentials | Improper Certificate Validation (CWE-295)
Summary
CAI Content Credentials is affected by an Improper Certificate Validation vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to bypass security measures and gain unauthorized write access. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 15:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation (CWE-295)
References
Impacted products
Vendor Product Version
Adobe Content Credentials Rust SDK Affected: 0 , ≤ c2pa-v0.90.5 (custom)
Unaffected: c2pa-v0.90.6 (custom)
Create a notification for this product.
Adobe Content Credentials Command-Line Tool Affected: 0 , ≤ c2patool-v0.27.5 (custom)
Unaffected: c2patool-v0.27.6 (custom)
Create a notification for this product.
Adobe Content Credentials JS SDK Affected: 0 , ≤ @contentauth/c2pa-web@0.12.0 (custom)
Unaffected: @contentauth/c2pa-web@0.12.1 (custom)
Create a notification for this product.
Date Public
2026-08-11 17:00
Show details on NVD website

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CVE-2026-48249 (GCVE-0-2026-48249)

Vulnerability from cvelistv5 – Published: 2026-05-21 17:11 – Updated: 2026-07-28 01:49
VLAI
Title
Open ISES Tickets < 3.44.2 Disabled TLS Certificate Verification in rm/incs/mobile_login.inc.php
Summary
Open ISES Tickets before 3.44.2 disables TLS certificate verification in rm/incs/mobile_login.inc.php by setting CURLOPT_SSL_VERIFYPEER to false (and not setting CURLOPT_SSL_VERIFYHOST) when issuing outbound HTTPS requests issued during the mobile (RouteMate) login flow. An attacker positioned on the network path between the server and the remote endpoint can present a forged certificate to intercept, monitor, or modify the request and response, including any API keys or session-bearing data in transit.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-21 18:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
Open ISES Tickets Affected: 0 , < 3.44.2 (semver)
    cpe:2.3:a:tickets_project:tickets:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-04-02 00:00
Show details on NVD website

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CVE-2026-48248 (GCVE-0-2026-48248)

Vulnerability from cvelistv5 – Published: 2026-05-21 17:11 – Updated: 2026-07-28 01:49
VLAI
Title
Open ISES Tickets < 3.44.2 Disabled TLS Certificate Verification in incs/login.inc.php
Summary
Open ISES Tickets before 3.44.2 disables TLS certificate verification in incs/login.inc.php by setting CURLOPT_SSL_VERIFYPEER to false (and not setting CURLOPT_SSL_VERIFYHOST) when issuing outbound HTTPS requests issued during the login/authentication flow. An attacker positioned on the network path between the server and the remote endpoint can present a forged certificate to intercept, monitor, or modify the request and response, including any API keys or session-bearing data in transit.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-23 02:25 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
Open ISES Tickets Affected: 0 , < 3.44.2 (semver)
    cpe:2.3:a:tickets_project:tickets:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-04-02 00:00
Show details on NVD website

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    "cveId": "CVE-2026-48248",
    "datePublished": "2026-05-21T17:11:17.519Z",
    "dateReserved": "2026-05-21T13:15:18.102Z",
    "dateUpdated": "2026-07-28T01:49:23.781Z",
    "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.