Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.
Priority LOW 38CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.
Why it matters now
EPSS 0.08191 94th percentileScored 2026-11-07
Fix Fixed org.apereo.cas:cas-server-core-web (Maven): 6.4.2
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | org.apereo.cas:cas-server-core-web (Maven) | before 6.4.2 | 6.4.2 | Patch available | GHSA-gfhx-jjwq-63gv |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- org.apereo.cas:cas-server-core-web (Maven) Vendor— Affected before 6.4.2 Fixed in 6.4.2 Patch available GHSA-gfhx-jjwq-63gv
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:* | 6.3.0 to before 6.3.7.1; 6.4.0 to before 6.4.2 | Vulnerable | Apereo |
- cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:* Versions 6.3.0 to before 6.3.7.1; 6.4.0 to before 6.4.2 Vulnerable ·Apereo
Remediation
- Fix · GHSA-gfhx-jjwq-63gv org.apereo.cas:cas-server-core-web (Maven) Fixed in 6.4.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42567
- 2026-10-03 Alias added: GHSA-gfhx-jjwq-63gv
References
More Apereo Central Authentication Service vulnerabilities
- TI-2023-13363 LDAP password leak in Apereo CAS - GHSL-2023-009 CVSS 3.1HIGH 7.5
- TI-2024-10382 Apereo CAS login session expiration CVSS 4.0MEDIUM 6.3
- TI-2024-10383 Apereo CAS 2FA login improper authentication CVSS 4.0MEDIUM 5.3
- TI-2024-10381 Apereo CAS login redirect CVSS 4.0MEDIUM 5.3
- TI-2024-04097 CAS <= 1.0.0 - Unauthenticated SSRF CVSS 3.1CRITICAL 9.1
- TI-2023-04254 MFA bypass in Apereo CAS CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-42567 · CVE Program
- CVE-2021-42567 · NVD
- FIRST EPSS
- GHSA-gfhx-jjwq-63gv · GitHub Advisory Database · CC BY 4.0
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