Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Apereo CAS versions up to and including 5.2.6 (package org.apereo.cas:cas-management-webapp-support) contain an inefficient regular expression complexity flaw triggered by the Query argument in the management web application's service controller. A remote attacker can send crafted input to cause excessive processing time. No fixed version is listed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.1 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | CNA (VulDB) |
- CISA KEV Not listed.
- EPSS 0.0063, the 50th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:09 UTC First seen by agentprime
- 31 Oct 2026, 15:09 UTC Confirmed by OSV