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Java CVE-2026-15243

| EUVDEUVD-2026-48560 HIGH
Improper Validation of Certificate with Host Mismatch (CWE-297)
2026-07-24 CERT-PL GHSA-52jg-6vw4-42p8
Information Disclosure Microsoft Java Java Apereo Cas Client Jasig Cas Client
7.4
CVSS 4.0 · Vendor: CERT-PL
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Severity by source

Vendor (CERT-PL) PRIMARY
7.4 HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (CERT-PL) · only source for this CVE.

CVSS VectorVendor: CERT-PL

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 26, 2026 - 11:52 vuln.today
CVE Published
Jul 24, 2026 - 11:29 cve.org
HIGH 7.4

DescriptionCVE.org

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.

AnalysisAI

Improper certificate validation in Apereo CAS Client 4.1.0 and Jasig CAS Client 3.6.4 allows a man-in-the-middle attacker to intercept Ticket-Granting Tickets (TGTs) by presenting any CA-signed certificate for a hostname matching the client's allowlist. An attacker with a network interception position can then obtain service tickets on behalf of the victim. No active exploitation or public exploit code is confirmed, and EPSS indicates low exploitation probability (0.17%).

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CVE-2026-15243 vulnerability details – vuln.today
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