Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Jenkins OpenId Connect Authentication Plugin (oic-auth) versions 4.354.v321ce67a_1de8 and earlier do not check the issuer (iss) claim of ID Tokens during authentication. An attacker may be able to subvert the authentication flow and potentially gain administrator access to Jenkins. Upgrade to version 4.355.v3a_fb_fca_b_96d4 or later, which checks the issuer claim when the issuer is known.
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 |
|---|---|---|---|---|
| 8.1 | High | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.0063, the 50th 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