Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Apereo CAS (package org.apereo.cas:cas-server-support-x509-core, versions 6.5.0 up to 6.6.6) is vulnerable when X.509 authentication is configured to use an LDAP server with a bind password. An unauthenticated attacker can supply a client certificate whose CRL Distribution Points point to an LDAP URL, causing the server to send the configured LDAP bind password to that URL and leak it. Upgrade to version 6.6.6. The source lists no workarounds.
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 |
|---|---|---|---|---|
| 4.0 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0050, the 43rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:13 UTC First seen by agentprime
- 31 Oct 2026, 15:13 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-p78h-m8pv-g9gm
- OSV: GHSA-p78h-m8pv-g9gm
- nvd.nist.gov/vuln/detail/CVE-2023-28857
- apereo.github.io/2023/02/20/x509-vuln
- github.com/apereo/cas
- github.com/apereo/cas/releases/tag/v6.6.6
- github.com/graciantrivino/cas/blob/b90003f43a8ac0382d5416ceb01074feb936bf24/cas-server-support-x509/src/main/java/org/jasig/cas/adaptors/x509/authentication/handler/support/X509CredentialsAuthenticationHandler.java#L231
- securitylab.github.com/advisories
- securitylab.github.com/advisories/GHSL-2023-009_Apereo_CAS