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Not in CISA KEV
MEDIUM severity

CVE-2021-21634 — jabber

MEDIUMFix: jenkinsci/jabber-plugin@67882cf

CVE-2021-21634 is a medium-severity (CVSS 6.5) CWE-522 vulnerability in org.jvnet.hudson.plugins:jabber. A fix is available for org.jvnet.hudson.plugins:jabber — see the affected versions and patch details below.

Passwords stored in plain text by Jenkins Jabber (XMPP) notifier and control Plugin

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs58th percentile — riskier than 58% of all scored CVEsHighest risk
0.00%0.45%0.89%1.33%0.0%0.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.jvnet.hudson.plugins:jabber

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Jenkins Jabber (XMPP) notifier and control Plugin 1.41 and earlier stores passwords unencrypted in its global configuration file hudson.plugins.jabber.im.transport.JabberPublisher.xml on the Jenkins controller as part of its configuration.

These passwords can be viewed by users with access to the Jenkins controller file system.

Jenkins Jabber (XMPP) notifier and control Plugin 1.42 stores passwords encrypted once its configuration is saved again.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jvnet.hudson.plugins:jabberall versions1.42org.jvnet.hudson.plugins:jabber:1.42

Affected Products

1 product · 1 configurations
Application
jabber \(xmpp\) notifier and controljenkins
≤ 1.41
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jvnet.hudson.plugins:jabber, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jvnet.hudson.plugins:jabber to 1.42 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21634 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Jenkins Jabber (XMPP) notifier and control Plugin 1.41 and earlier stores passwords unencrypted in its global configuration file `hudson.plugins.jabber.im.transport.JabberPublisher.xml` on the Jenkins controller as part of its configuration. These passwords can be viewed by users with access to the Jenkins controller file system. Jenkins Jabber (XMPP) notifier and control Plugin 1.42 stores passwords encrypted once its configuration is saved again.
O3 Security · Impact-Aware SCA

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CVE-2021-21634: jabber — Fixed in 1.42