CVE-2026-15243

Published: Lug 24, 2026 Last Modified: Lug 24, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,4
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: active
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

AI Translation Available

Apereo CAS Client accepts any CA-trusted certificate for any hostname, provided the URL the client is calling matches the configured allowlist or regex. An attacker with a MITM position (DNS poisoning, rogue Wi-Fi, malicious proxy, etc.) can provide any CA-signed certificate for a hostname that matches the configured allowlist or regex. This can lead to intercepting the CAS exchange, capturing the Ticket-Granting Ticket (TGT), and subsequently obtaining Service Tickets on behalf of the victim. 

Because maintainers contact attempts were unsuccessful, vulnerabilities have only been confirmed in version 4.1.0 (Java Apereo CAS Client) and 3.6.4 (Jasig CAS Client) but may also affect other versions.

297

Improper Validation of Certificate with Host Mismatch

Incomplete
Abstraction: Variant Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Authentication Other
Potential Impacts:
Gain Privileges Or Assume Identity Other
Applicable Platforms
Technologies: Not Technology-Specific, Mobile, Web Based
Likelihood of Exploit: High
View CWE Details
https://cert.pl/en/posts/2026/07/CVE-2026-15243
https://cert.pl/en/posts/2026/07/CVE-2026-15243
https://www.apereo.org/programs/software/cas
https://www.apereo.org/programs/software/cas