Common Weakness Enumeration
CWE-295
AllowedImproper 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-2026-21228 (GCVE-0-2026-21228)
Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-08-19 16:26
VLAI
EPSS
VEX
Title
Azure Local Remote Code Execution Vulnerability
Summary
Improper certificate validation in Azure Local allows an unauthorized attacker to execute code over a network.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-11 04:56 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Azure Local |
Affected:
1.0.0 , < 2510.0.3002
(custom)
cpe:2.3:a:microsoft:azure_local:*:*:*:*:*:*:*:* |
Date Public
2026-02-10 16:00
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CVE-2026-20500 (GCVE-0-2026-20500)
Vulnerability from cvelistv5 – Published: 2026-09-07 01:57 – Updated: 2026-09-07 10:41
VLAI
EPSS
VEX
Summary
In Modem, there is a possible system crash due to improper input validation. This could lead to local denial of service with User execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01810811; Issue ID: MSV-9232.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-07 10:41 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MediaTek, Inc. | MediaTek chipset |
Affected:
MT2716
Affected: MT6835 Affected: MT6858 Affected: MT6878 Affected: MT6881 Affected: MT6897 Affected: MT6899 Affected: MT6982VB Affected: MT6986 Affected: MT6988 Affected: MT6991 Affected: MT6993 Affected: MT8668 Affected: MT8676 Affected: MT8678 Affected: MT8755 Affected: MT8775 Affected: MT8792 Affected: MT8793 Affected: MT8863 Affected: MT8873 Affected: MT8883 |
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CVE-2026-20184 (GCVE-0-2026-20184)
Vulnerability from cvelistv5 – Published: 2026-04-15 16:03 – Updated: 2026-04-16 19:07
VLAI
EPSS
VEX
Title
Cisco Webex Meetings Certificate Validation Vulnerability
Summary
A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed an unauthenticated, remote attacker to impersonate any user within the service.
This vulnerability existed because of improper certificate validation. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by connecting to a service endpoint and supplying a crafted token. A successful exploit could have allowed the attacker to gain unauthorized access to legitimate Cisco Webex services.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 00:00 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Webex Meetings |
Affected:
39.7.7
Affected: 39.9 Affected: 40.4.10 Affected: 39.6 Affected: 40.6.2 Affected: 39.8.2 Affected: 39.8.4 Affected: 40.1 Affected: 39.11 Affected: 39.7.4 Affected: 39.9.1 Affected: 40.4 Affected: 40.6 Affected: 39.7 Affected: 39.8 Affected: 39.8.3 Affected: 40.2 Affected: 39.10 Affected: 42.6 Affected: 42.7 Affected: 42.8 Affected: 42.9 Affected: 42.10 Affected: 42.11 Affected: 42.12 Affected: 43.1 Affected: 43.2 Affected: 43.3 Affected: 43.4 Affected: 43.4.1 Affected: 43.4.2 Affected: 43.5.0 Affected: 43.6.0 Affected: 43.6.1 Affected: 43.7 Affected: 43.8 Affected: 43.9 Affected: 43.10 Affected: 43.11 Affected: 43.12 Affected: 44.1 Affected: 44.2 Affected: 44.3 Affected: 44.4 Affected: 44.5 Affected: 44.6 Affected: 44.7 Affected: 44.8 Affected: 44.9 Affected: 44.10 Affected: 44.11 Affected: 44.12 Affected: 45.1 Affected: 45.2 Affected: 45.3 Affected: 45.4 |
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GCVE-1-2026-20085 (CVE-2026-85221)
Vulnerability from gna-1 – Published: 2026-09-03 14:16 – Updated: 2026-09-03 14:16
VLAI
EPSS
VEX
Title
MISP CurlClient TLS Peer Verification Disabled by Default Enables Man-in-the-Middle Attacks
Summary
MISP contains an improper TLS certificate validation vulnerability in CurlClient. The CurlClient::$verifyPeer property was not explicitly initialized and therefore defaulted to null. When passed to cURL, this value effectively disabled TLS peer verification unless the calling code explicitly enabled it.
As a result, HTTPS connections made through affected CurlClient instances could accept certificates that were not issued by a trusted certificate authority. An attacker capable of intercepting or manipulating network traffic between a MISP instance and a remote HTTPS service could impersonate the remote endpoint and perform a man-in-the-middle attack.
Successful exploitation could allow an attacker to observe sensitive information transmitted by MISP, including authentication material or exchanged threat intelligence, and to modify responses returned to the MISP instance. The impact depends on the functionality using CurlClient and the data exchanged with the remote service.
The patch enables TLS peer verification by default while preserving explicit support for configured self-signed certificates. It also corrects the self-signed certificate handling in SyncTool so that peer verification is disabled only when no pinned CA certificate is configured.
Severity
CWE
- CWE-295 - Improper Certificate Validation
Assigner
GNA-1
This instance
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MISP/MISP/commit/e06f69858 | patch |
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CVE-2026-20042 (GCVE-0-2026-20042)
Vulnerability from cvelistv5 – Published: 2026-04-01 16:27 – Updated: 2026-04-02 03:56
VLAI
EPSS
VEX
Title
Cisco Nexus Dashboard Configuration REST API Unauthorized Access Vulnerability
Summary
A vulnerability in the configuration backup feature of Cisco Nexus Dashboard could allow an attacker who has the encryption password and access to Full or Config-only backup files to access sensitive information.
This vulnerability exists because authentication details are included in the encrypted backup files. An attacker with a valid backup file and encryption password from an affected device could decrypt the backup file. The attacker could then use the authentication details in the backup file to access internal-only APIs on the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system as the root user.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-01 00:00 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Nexus Dashboard |
Affected:
1.1(3e)
Affected: 1.1(3c) Affected: 1.1(3d) Affected: 1.1(0d) Affected: 1.1(2i) Affected: 2.0(1b) Affected: 1.1(2h) Affected: 1.1(0c) Affected: 1.1(3f) Affected: 2.1(1d) Affected: 2.1(1e) Affected: 2.0(2g) Affected: 2.0(2h) Affected: 2.1(2d) Affected: 2.0(1d) Affected: 2.2(1h) Affected: 2.2(1e) Affected: 2.2(2d) Affected: 2.1(2f) Affected: 2.3(1c) Affected: 2.3(2b) Affected: 2.3(2c) Affected: 2.3(2d) Affected: 2.3(2e) Affected: 3.0(1f) Affected: 3.0(1i) Affected: 3.1(1k) Affected: 3.1(1l) Affected: 3.2(1e) Affected: 3.2(1i) Affected: 3.3(1a) Affected: 3.3(1b) Affected: 3.3(2b) Affected: 4.0(1i) Affected: 3.3(2g) Affected: 3.2(2f) Affected: 3.2(2g) Affected: 3.2(2m) Affected: 3.1(1n) Affected: 4.1(1g) |
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CVE-2026-18717 (GCVE-0-2026-18717)
Vulnerability from cvelistv5 – Published: 2026-08-27 20:20 – Updated: 2026-08-28 15:58
VLAI
EPSS
VEX
Title
Improper Certificate Validation in ASE 2000
Summary
ASE2000 2.35 through 2.37 is vulnerable to an improper certificate validation vulnerability, which may allow an attacker to impersonate the trusted peer, complete the TLS handshake, and read or modify protected communications.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 15:45 UTC
CWE
- CWE-295 - Improper certificate validation
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Applied Systems Engineering | ASE2000 V2 |
Affected:
2.25 , ≤ 2.37
(custom)
Unaffected: 2.38 |
Date Public
2026-08-27 18:30
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CVE-2026-18679 (GCVE-0-2026-18679)
Vulnerability from cvelistv5 – Published: 2026-08-12 18:52 – Updated: 2026-08-13 14:45
VLAI
EPSS
VEX
Title
Kong Mesh: kuma-dp connects to the control plane without verifying the TLS certificate when no CA is configured
Summary
When kuma-dp is started against an HTTPS control plane and the operator did not pass a CA certificate, the data plane connects with TLS peer verification disabled, and the dataplane authentication token is sent over that unverified connection.
An on-path actor can intercept the dataplane authentication token and impersonate the control plane to the data plane, injecting a forged bootstrap configuration and taking over the proxy.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:45 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/kumahq/kuma/security/advisorie… | vendor-advisory |
| https://github.com/kumahq/kuma/pull/16777 | patch |
| https://developer.konghq.com/mesh/changelog/ | release-notes |
Impacted products
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CVE-2026-18678 (GCVE-0-2026-18678)
Vulnerability from cvelistv5 – Published: 2026-08-12 18:49 – Updated: 2026-08-13 14:47
VLAI
EPSS
VEX
Title
Kong Mesh: kumactl connects to the control plane without verifying the TLS certificate when no CA is configured
Summary
When an operator adds an HTTPS control plane profile to kumactl without providing a CA certificate, kumactl disables TLS verification and sends API tokens over the unverified connection.
An attacker on the network path between the operator and the control plane can intercept user or admin API tokens and then act against the control plane as that user.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:47 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/kumahq/kuma/security/advisorie… | vendor-advisory |
| https://github.com/kumahq/kuma/pull/16777 | patch |
| https://developer.konghq.com/mesh/changelog/ | release-notes |
Impacted products
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CVE-2026-18257 (GCVE-0-2026-18257)
Vulnerability from cvelistv5 – Published: 2026-07-29 16:34 – Updated: 2026-07-29 18:04
VLAI
EPSS
VEX
Title
Improper Certificate Validation in S2OPC
Summary
Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted
Severity
5.6 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 18:04 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
Impacted products
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CVE-2026-18141 (GCVE-0-2026-18141)
Vulnerability from cvelistv5 – Published: 2026-07-31 15:34 – Updated: 2026-08-04 21:42
VLAI
EPSS
VEX
Title
Aap-gateway: aap-gateway: authentication bypass in event-driven ansible via forged http header
Summary
A flaw was found in aap-gateway, a component of Ansible Automation Platform's Event-Driven Ansible (EDA). An unauthenticated remote attacker can bypass mutual Transport Layer Security (mTLS) authentication for event streams. This is achieved by manipulating the event stream URL and forging the HTTP Subject header. The system also inadvertently discloses the expected certificate subject in error messages, which simplifies the attack. This vulnerability allows an attacker to inject arbitrary events into EDA, potentially triggering automated workflows.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 18:58 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:50336 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:50340 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:50479 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-18141 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2508155 | issue-trackingx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:1.2.11-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el10 cpe:/a:redhat:ansible_automation_platform:2.6::el9 cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10 cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9 cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1785780020 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2.7 |
Unaffected:
1785435970 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.7::el9 |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
Date Public
2026-07-31 15:28
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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.