CVE-2026-15243 Vulnerability Analysis & Exploit Details

CVE-2026-15243
Vulnerability Scoring

Analysis In Progress
Analysis In Progress

Attack Complexity Details

  • Attack Complexity:
    Attack Complexity Analysis In Progress
  • Attack Vector:
    Attack Vector Under Analysis
  • Privileges Required: None
    No authentication is required for exploitation.
  • Scope:
    Impact is confined to the initially vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-15243 Details

Status: Received on 24 Jul 2026, 12:16 UTC

Published on: 24 Jul 2026, 12:16 UTC

CVSS Release:

CVE-2026-15243 Vulnerability Summary

CVE-2026-15243: 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.

Assessing the Risk of CVE-2026-15243

Access Complexity Graph

The exploitability of CVE-2026-15243 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-15243

No exploitability data is available for CVE-2026-15243.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-15243, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-15243, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-15243 does not compromise confidentiality.
  • Integrity: None
    CVE-2026-15243 does not impact data integrity.
  • Availability: None
    CVE-2026-15243 does not affect system availability.

CVE-2026-15243 References

External References

CWE Common Weakness Enumeration

CWE-297

Protect Your Infrastructure against CVE-2026-15243: Combat Critical CVE Threats

Stay updated with real-time CVE vulnerabilities and take action to secure your systems. Enhance your cybersecurity posture with the latest threat intelligence and mitigation techniques. Develop the skills necessary to defend against CVEs and secure critical infrastructures. Join the top cybersecurity professionals safeguarding today's infrastructures.

Other 5 Recently Published CVEs Vulnerabilities

  • CVE-2026-9765 – Note: The CVE and blog post don't exist because we determined this is actually a cloud-only issue. Access Controls are “Broken” when a user can ac...
  • CVE-2026-7484 – External control of Assumed-Immutable web parameter vulnerability in ABIS Technology Ltd. Co. AVESİS allows Accessing Functionality Not Properly Co...
  • CVE-2026-66144 – Although remote policy references are not retrieved during policy normalization, if they are manually retrieved via the API it can cause a denial o...
  • CVE-2026-66143 – It is possible to bypass the maximum number of normalized policy alternatives that was introduced in Apache Neethi 3.2.2 via certain crafted polici...
  • CVE-2026-66142 – Apache Neethi is vulnerable to uncontrolled recursion when parsing policies that lack policy Ids or with deeply nested structures, which may lead t...