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Advisory record · GHSA-92m7-4fpw-2wxm

Jenkins: Open Redirect phishing attacks possible via "from" parameter in "Delegate to servlet container"

CVSS 4.3 MediumEPSS 0.0021 · 11th percentile

Published by the GitHub Advisory Database at 10 Jun 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.jenkins-ci.main:jenkins-coreMaven<2.555.3 || >=2.556, <2.5682.555.3, 2.568
Identifiers
GHSA-92m7-4fpw-2wxm · BIT-jenkins-2026-53440 · CVE-2026-53440
Weakness (CWE)
CWE-601
Tags
Published
10 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Jenkins core (Maven org.jenkins-ci.main:jenkins-core) versions below 2.555.3, and from 2.556 up to but not including 2.568, are vulnerable. The "from" parameter of the "Delegate to servlet container" security realm is not checked before redirecting users after login, so an attacker can send users to an attacker-controlled domain for phishing; the source gives few further details. Upgrade to 2.555.3 or 2.568 or later.

Written 2 Nov 2026.

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

ScoreRatingCVSSVectorSource
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0021, the 11th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.