CWE-295

Improper Certificate Validation

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

CVE-2026-44213 (GCVE-0-2026-44213)

Vulnerability from cvelistv5 – Published: 2026-05-26 21:34 – Updated: 2026-05-27 15:51
VLAI
Title
OpenTelemetry.Exporter.Instana bypasses TLS certificate validation when a proxy is configured
Summary
The OpenTelemetry.Exporter.Instana exports telemetry to Instana backend. Prior to 1.1.0, the OpenTelemetry.Exporter.Instana NuGet package does not validate HTTPS/TLS certificates are valid when sending telemetry to a configured Instana back-end when a proxy is configured using the INSTANA_ENDPOINT_PROXY environment variable. If a network attacker can Man-in-the-Middle (MitM) the proxy connection, all OpenTelemetry telemetry data and the Instana API key are exposed to the attacker. This vulnerability is fixed in 1.1.0.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-44305 (GCVE-0-2026-44305)

Vulnerability from cvelistv5 – Published: 2026-05-12 21:28 – Updated: 2026-05-13 14:26
VLAI
Title
Lemur: LDAP TLS certificate verification globally disabled enables credential interception
Summary
Lemur manages TLS certificate creation. Prior to 1.9.0, when LDAP TLS is enabled (LDAP_USE_TLS = True), Lemur's LDAP authentication module unconditionally disables TLS certificate verification at the global ldap module level. This allows a man-in-the-middle attacker positioned between Lemur and the LDAP server to intercept all authentication credentials. This vulnerability is fixed in 1.9.0.
Severity
6.8 (Medium)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
Netflix lemur Affected: < 1.9.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-44309 (GCVE-0-2026-44309)

Vulnerability from cvelistv5 – Published: 2026-05-15 16:22 – Updated: 2026-05-15 17:43
VLAI
Title
gitsign verify accepts signatures over go-git-normalized bytes, enabling trust confusion on malformed commits
Summary
Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. Prior to 0.16.0, gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees: git-core uses the first, go-git uses the second. A signature crafted over the go-git-normalized form (second tree) passes gitsign verify while git-core resolves the commit to a completely different tree. This breaks the invariant that a verified signature, the commit semantics git-core presents to users, and the object hash logged in Rekor all refer to the same content. This vulnerability is fixed in 0.16.0.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
sigstore gitsign Affected: < 0.16.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-44312 (GCVE-0-2026-44312)

Vulnerability from cvelistv5 – Published: 2026-05-14 16:15 – Updated: 2026-05-15 18:05
VLAI
Title
css_parser allows to MITM included https css urls
Summary
css_parser is a Ruby CSS parser. Prior to 2.1.0 and 1.22.0, the CSS Parser gem does not validate HTTPS connections, allowing a Man-in-the-Middle (MITM) attacker to inject or modify CSS content when stylesheets are loaded via HTTPS. The connection is established with OpenSSL::SSL::VERIFY_NONE, meaning any HTTPS certificate—even entirely untrusted—will be accepted without validation. This vulnerability is fixed in 2.1.0 and 1.22.0.
Severity
5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE
  • CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
premailer css_parser Affected: >= 2.0.0, < 2.1.0
Affected: < 1.22.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-4434 (GCVE-0-2026-4434)

Vulnerability from cvelistv5 – Published: 2026-03-20 12:52 – Updated: 2026-03-23 14:12
VLAI
Summary
Improper certificate validation in the PAM propagation WinRM connections allows a network attacker to perform a man-in-the-middle attack via disabled TLS certificate verification.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-295 - Improper certificate validation
Assigner
References
Impacted products
Vendor Product Version
Devolutions Server Affected: 0 , < 2026.1 (custom)
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Show details on NVD website
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CVE-2026-44363 (GCVE-0-2026-44363)

Vulnerability from cvelistv5 – Published: 2026-05-13 19:16 – Updated: 2026-05-14 12:31
VLAI
Title
Unsafe remote resource fetching in expansion misp-modules
Summary
MISP modules are autonomous modules that can be used to extend MISP for new services. Prior to 3.0.7, an unsafe remote resource fetching vulnerability existed in MISP Modules expansion modules. The html_to_markdown module accepted arbitrary HTTP(S) URLs without sufficient validation, which could allow Server-Side Request Forgery against loopback, private, or link-local network resources. Additionally, the qrcode module disabled TLS certificate verification when retrieving remote images, exposing requests to potential man-in-the-middle interception or response tampering. The issue was fixed by validating URL schemes, blocking local and private address ranges, resolving hostnames before fetching, enforcing request timeouts, and re-enabling TLS certificate verification. This vulnerability is fixed in 3.0.7.
Severity
5.8 (Medium)
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:H
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
MISP misp-modules Affected: < 3.0.7
Create a notification for this product.
Show details on NVD website
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CVE-2026-44700 (GCVE-0-2026-44700)

Vulnerability from cvelistv5 – Published: 2026-05-14 20:51 – Updated: 2026-05-15 11:22
VLAI
Title
Elixir WebRTC: Missing DTLS peer fingerprint validation in ex_webrtc client-role handshake
Summary
Elixir WebRTC is an Elixir implementation of the W3C WebRTC API. Prior to 0.15.1 and 0.16.1, missing DTLS peer certificate fingerprint validation in the DTLS client (active) role removes one side of WebRTC's mutual authentication. The bug is not independently exploitable for media interception in standard deployments, but enables a full man-in-the-middle attack when chained with insecure signalling or a peer with similar validation gaps. This vulnerability is fixed in 0.15.1 and 0.16.1.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
elixir-webrtc ex_webrtc Affected: < 0.15.1
Affected: >= 0.16.0, < 0.16.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-44900 (GCVE-0-2026-44900)

Vulnerability from cvelistv5 – Published: 2026-05-26 21:04 – Updated: 2026-05-26 21:04
VLAI
Title
epa4all-client: VAU Signature bypass
Summary
epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.1, in SignedPublicKeysTrustValidatorImpl.isTrusted(), the ECDSA signature verification at line 45 discards the boolean return value of Signature.verify(). The method performs certificate chain validation, OCSP check, and signature algorithm setup, but never checks whether the signature actually matches. For any structurally valid signature, it returns true. This vulnerability is fixed in 1.2.1.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-45574 (GCVE-0-2026-45574)

Vulnerability from cvelistv5 – Published: 2026-05-26 21:03 – Updated: 2026-05-27 13:21
VLAI
Title
epa4all-client: TLS Certificate Validation Disabled in Production
Summary
epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.2, an attacker on the network path between the ePA service and the Konnektor can present any TLS certificate (self-signed, expired, wrong CN) and intercept all SOAP traffic. This includes patient identifiers (KVNR), SMC-B card operations (authentication, signing), document content, and credential exchanges. This vulnerability is fixed in 1.2.2.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-4587 (GCVE-0-2026-4587)

Vulnerability from cvelistv5 – Published: 2026-03-23 12:46 – Updated: 2026-03-23 13:46
VLAI
Title
HybridAuth SSL Curl.php certificate validation
Summary
A vulnerability was found in HybridAuth up to 3.12.2. This issue affects some unknown processing of the file src/HttpClient/Curl.php of the component SSL Handler. The manipulation of the argument curlOptions results in improper certificate validation. The attack can be launched remotely. This attack is characterized by high complexity. The exploitability is assessed as difficult. The project was informed of the problem early through an issue report but has not responded yet.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:R
3.7 (Low)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:R
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-287 - Improper Authentication
Assigner
References
Impacted products
Vendor Product Version
n/a HybridAuth Affected: 3.12.0
Affected: 3.12.1
Affected: 3.12.2
Credits
jstyles (VulDB User)
Show details on NVD website
To clipboard 

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Mitigation

Phases: Architecture and Design, Implementation

Description:

  • Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Mitigation

Phase: Implementation

Description:

  • 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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