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Common Weakness Enumeration

CWE-295

Allowed

Improper Certificate Validation

Abstraction: Base · Status: Draft

API response cwe.mitre.org

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

2121 vulnerabilities reference this CWE, most recent first.

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.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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
Assigner
References
Impacted products
Vendor Product Version
benoitc erlang_quic Affected: < 1.4.4
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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.
Severity
8.7 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
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
Assigner
References
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
To clipboard 

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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.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Airflow Affected: 2.0.0 , < 3.2.2 (semver)
Create a notification for this product.
Credits
Francis Bergin (@francisbergin) Jarek Potiuk
Show details on NVD website
To clipboard 

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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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
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)
Assigner
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
To clipboard 

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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.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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
Assigner
References
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
To clipboard 

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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.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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
Assigner
References
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
To clipboard 

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CVE-2026-48247 (GCVE-0-2026-48247)

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/functions.inc.php
Summary
Open ISES Tickets before 3.44.2 disables TLS certificate verification in incs/functions.inc.php by setting CURLOPT_SSL_VERIFYPEER to false (and not setting CURLOPT_SSL_VERIFYHOST) when issuing outbound HTTPS requests for general-purpose outbound HTTPS requests issued by the shared helper functions. 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.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-21 18:05 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
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
To clipboard 

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CVE-2026-48246 (GCVE-0-2026-48246)

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 ajax/reports.php
Summary
Open ISES Tickets before 3.44.2 disables TLS certificate verification in ajax/reports.php by setting CURLOPT_SSL_VERIFYPEER to false (and not setting CURLOPT_SSL_VERIFYHOST) when issuing outbound HTTPS requests for Google Maps Directions API lookups during incident report generation. 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.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-21 18:05 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
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
To clipboard 

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CVE-2026-48021 (GCVE-0-2026-48021)

Vulnerability from cvelistv5 – Published: 2026-07-24 18:26 – Updated: 2026-07-25 00:57
VLAI
Title
epa4all Security Incident: Implement keystore based on Telematik TSL, implement hostname check and certificate check for lib-vau
Summary
In epa4all, prior to version 2026-05-20, an attacker who can intercept the TLS connection between epa4all and the ePA backend can complete the VAU handshake with attacker-controlled keys and obtain the session encryption keys. All inner HTTP traffic (patient consent decisions, medication data, document operations, authorization tokens, and entitlement queries) becomes readable and modifiable. The attacker can also inject arbitrary requests through the hijacked channel. This issue has been patched in version 2026-05-20.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-25 00:56 UTC
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
med-united epa4all Affected: < 2026-05-20
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-47632 (GCVE-0-2026-47632)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:05 – Updated: 2026-09-09 19:36
VLAI
Title
Azure Connected Machine Agent Elevation of Privilege Vulnerability
Summary
Improper certificate validation in Azure Connected Machine Agent allows an unauthorized attacker to elevate privileges over an adjacent network.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
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
Assigner
References
Impacted products
Vendor Product Version
Microsoft Azure Connected Machine Agent Affected: 1.0.0 , < 1.65 (custom)
    cpe:2.3:a:microsoft:azure_connected_machine_agent:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-14 14:00
Show details on NVD website
To clipboard 

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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.

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