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Advisory record · GHSA-53ph-2r2x-vqw8

Cross-site WebSocket hijacking vulnerability in the Jenkins CLI

CVSS 8.8 HighCriticalEPSS 0.67 · 99th percentile

Critical, because:

  • CVSS score 8.8 (7.0 or more) and EPSS 0.67 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 24 Jan 2024, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.jenkins-ci.main:jenkins-coreMaven>=2.217, <2.426.3 || >=2.427, <2.442 || =2.4412.426.3, 2.442
Identifiers
GHSA-53ph-2r2x-vqw8 · BIT-jenkins-2024-23898 · CVE-2024-23898
Weakness (CWE)
CWE-346
Tags
Published
24 Jan 2024
Updated
7 Aug 2026

Machine-written summary

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

Jenkins core (org.jenkins-ci.main:jenkins-core) versions 2.217 through 2.441 and LTS 2.222.1 through 2.426.2 are affected. The CLI WebSocket endpoint does not validate request origins, so an attacker who can lure a logged-in user to a malicious web page may hijack the WebSocket connection and run CLI commands with that user's privileges. Upgrade to Jenkins 2.442 or LTS 2.426.3.

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
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.67, the 99th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.