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.

2334 vulnerabilities reference this CWE, most recent first.

CVE-2026-67294 (GCVE-0-2026-67294)

Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-03 18:15
VLAI
Title
FreeRDP before 3.29.0 TLS Certificate EKU Bypass
Summary
FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 18:15 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6614 records in the last 180 days details
References
Impacted products
Vendor Product Version
FreeRDP FreeRDP Affected: 0 , < 3.29.0 (semver)
Unaffected: 3.29.0 (semver)
    cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-15 00:00
Credits
1121984919
Show details on NVD website
To clipboard 

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CVE-2026-67293 (GCVE-0-2026-67293)

Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-05 13:40
VLAI
Title
FreeRDP before 3.29.0 Improper Certificate Hostname Validation
Summary
FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains an improper certificate hostname validation vulnerability. The TLS hostname matcher (tls_match_hostname() in libfreerdp/crypto/tls.c) treats a wildcard pattern such as *.example.com as matching any hostname ending in .example.com, so it incorrectly accepts a wildcard certificate for multi-label subdomains like a.b.example.com (which OpenSSL's X509_check_host() rejects). This weakens TLS server authentication under wildcard-certificate conditions.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
4.2 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 03:56 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6614 records in the last 180 days details
References
Impacted products
Vendor Product Version
FreeRDP FreeRDP Affected: 0 , < 3.29.0 (semver)
Unaffected: 3.29.0 (semver)
    cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-15 00:00
Credits
1121984919
Show details on NVD website
To clipboard 

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CVE-2026-67270 (GCVE-0-2026-67270)

Vulnerability from cvelistv5 – Published: 2026-10-06 15:06 – Updated: 2026-10-09 01:06
VLAI
Summary
Dell Container Storage Modules (CSM) versions prior to 1.18.0, contains an Improper Certificate Validation vulnerability in the proxy-server component. An unauthenticated adjacent network attacker could potentially exploit this vulnerability, leading to information exposure of storage backend administrator credentials.
Severity
8.2 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 01:06 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
dell CNA under the mitre root
CNA scorecard C 70/100 over 442 records in the last 180 days details
References
Impacted products
Vendor Product Version
Dell Container Storage Modules (CSM) Affected: 0 , < 1.18.0 or later (semver)
Create a notification for this product.
Date Public
2026-10-01 06:30
Credits
Dell would like to thank chwrld for reporting these issues.
Show details on NVD website
To clipboard 

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CVE-2026-67231 (GCVE-0-2026-67231)

Vulnerability from cvelistv5 – Published: 2026-09-23 20:47 – Updated: 2026-09-29 02:18
VLAI
Title
RabbitMQ: Trust-store whitelist by Issuer+Serial only
Summary
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, The trust-store plugin installs a verify_fun that overrides {bad_cert, unknown_ca} / {bad_cert, selfsigned_peer} when the presented cert "matches" a whitelisted one. The match key is extract_issuer_id/1 → public_key:pkix_issuer_id/2 → {IssuerName, SerialNumber} , both fields are taken verbatim from the presented certificate body and contain no public-key, SKI, fingerprint or signature material. is_whitelisted/1 is a pure ets:member lookup; the stored full DER is used only for list/0 display and is never compared against the presented cert. cacerts is [], so the whitelisted cert is never used as a trust anchor for path validation either. TLS client-authentication bypass: an attacker who knows the issuer DN + serial of any whitelisted certificate can connect with a forged self-signed cert. Preconditions include rabbitmq_trust_store plugin enabled and used as the TLS verify_fun Attacker knows or can guess the {Issuer, Serial} of at least one whitelisted cert (non-secret; exposed via CLI/logs/any cert copy). This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Severity
9.1 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 02:17 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7639 records in the last 180 days details
References
Impacted products
Vendor Product Version
rabbitmq rabbitmq-server Affected: >= 3.13.0, < 3.13.15
Affected: >= 4.0.0, < 4.0.20
Affected: >= 4.1.0, < 4.1.11
Affected: >= 4.2.0, < 4.2.6
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Show details on NVD website
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CVE-2026-66795 (GCVE-0-2026-66795)

Vulnerability from cvelistv5 – Published: 2026-08-17 20:45 – Updated: 2026-09-29 19:41
VLAI
Title
Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke→hub cluster-admin)
Summary
A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster.
Severity
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 15:15 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1039 records in the last 180 days details
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:59556 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59557 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59558 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59559 vendor-advisoryx_refsource_REDHAT
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https://access.redhat.com/errata/RHSA-2026:59593 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-66795 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2507540 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat multicluster engine for Kubernetes 2.10 Unaffected: 1787078272 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.10::el9
Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.11 Unaffected: 1787078330 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.11::el9
Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.17 Unaffected: 1786577915 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.17::el9
Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.6 Unaffected: 1787260779 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.6::el9
Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.8 Unaffected: 1787259044 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.8::el9
Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.9 Unaffected: 1787078307 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.9::el9
Create a notification for this product.
Date Public
2026-08-17 20:29
Show details on NVD website
To clipboard 

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CVE-2026-66760 (GCVE-0-2026-66760)

Vulnerability from cvelistv5 – Published: 2026-08-11 00:17 – Updated: 2026-08-11 14:29
VLAI
Title
Multiple vulnerabilities in SAP Business AI Platform (Approuter)
Summary
SAP Approuter does not correctly validate client certificates in certain callback flows. An attacker with low privileges, holding a certificate from the same trusted authority with matching subject values, could bypass the identity check. This complexity makes the attack difficult to execute. Successful exploitation could allow impersonation of a trusted internal component, resulting in a high impact on integrity and a low impact on confidentiality and availability.
Severity
6.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 13:17 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
sap CNA under the mitre root
CNA scorecard C 65/100 over 117 records in the last 180 days details
References
Impacted products
Vendor Product Version
SAP_SE SAP Business AI Platform (Approuter) Affected: SAP Approuter node.js package < 23.0.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-66410 (GCVE-0-2026-66410)

Vulnerability from cvelistv5 – Published: 2026-08-10 08:08 – Updated: 2026-08-10 11:11
VLAI
Summary
Android and iOS apps ECOVACS PRO App improperly validate server certificates. Communication may be retrieved and/or altered.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
2.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 11:08 UTC
CWE
  • CWE-295 - Improper certificate validation
Assigner
jpcert CNA under the jpcert root
CNA scorecard C 64/100 over 176 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-66406 (GCVE-0-2026-66406)

Vulnerability from cvelistv5 – Published: 2026-08-10 08:00 – Updated: 2026-08-10 17:54
VLAI
Summary
DEEBOT PRO M1 and DEEBOT PRO K1VAC use wget command with server certificate validation disabled. A man-in-the-middle attack may allow to obtain and/or alter communications of the affected products. As a result, arbitrary code may be executed with the administrative privilege.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
2.3 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 17:52 UTC
CWE
  • CWE-295 - Improper certificate validation
Assigner
jpcert CNA under the jpcert root
CNA scorecard C 64/100 over 176 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-66404 (GCVE-0-2026-66404)

Vulnerability from cvelistv5 – Published: 2026-08-10 07:59 – Updated: 2026-08-10 17:47
VLAI
Summary
DEEBOT PRO M1 and DEEBOT PRO K1VAC do not validate server certificates in MQTT communications. Operation logs and activity logs stored on the affected products may be retrieved.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
6 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 17:45 UTC
CWE
  • CWE-295 - Improper certificate validation
Assigner
jpcert CNA under the jpcert root
CNA scorecard C 64/100 over 176 records in the last 180 days details
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-66402 (GCVE-0-2026-66402)

Vulnerability from cvelistv5 – Published: 2026-08-01 12:22 – Updated: 2026-08-05 03:56
VLAI
Title
FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
Summary
FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains multiple TLS certificate identity validation weaknesses in tls_verify_certificate(), tls_match_hostname(), and x509_utils_get_dns_names(). Because FreeRDP performs custom Common Name and DNS SAN string matching instead of using OpenSSL's length-aware identity validation APIs, it (1) truncates DNS SAN values at embedded NUL bytes (accepting e.g. 'victim.example\0.attacker.example' as 'victim.example'), (2) accepts a matching Common Name even when non-matching DNS SAN entries are present, and (3) accepts IP-literal targets via DNS/CN matching without comparing iPAddress SANs. Under a trusted or misissued certificate chain, an attacker positioned to present such a certificate can bypass server identity verification, weakening TLS server authentication.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 00:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6614 records in the last 180 days details
References
Impacted products
Vendor Product Version
FreeRDP FreeRDP Affected: 0 , < 3.29.0 (semver)
Unaffected: 3.29.0 (semver)
    cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-15 00:00
Credits
1121984919
Show details on NVD website
To clipboard 

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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-66402",
    "datePublished": "2026-08-01T12:22:17.331Z",
    "dateReserved": "2026-07-26T12:22:34.139Z",
    "dateUpdated": "2026-08-05T03:56:18.042Z",
    "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.

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