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☕ Maven
Not in CISA KEV
HIGH severity

CVE-2021-21659 — urltrigger

HIGH

CVE-2021-21659 is a high-severity (CVSS 8.1) vulnerability in org.jenkins-ci.plugins:urltrigger. EPSS puts its 30-day exploitation probability at 66.8% (99th percentile). A fix is available for org.jenkins-ci.plugins:urltrigger — see the affected versions and patch details below.

XXE vulnerability in Jenkins URLTrigger Plugin

Also known asGHSA-34j5-c4cv-mmg5
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
66.8%probability of exploitation in next 30 days
High Risk0.00%
Lower risk than most CVEs99th percentile — riskier than 99% of all scored CVEsHighest risk
0.00%28.9%57.8%86.7%0.3%66.8%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.jenkins-ci.plugins:urltrigger

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 URLTrigger Plugin 0.48 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

This allows attackers with Job/Configure permission or otherwise able to control the contents of an URL to an XML document being examined for changes to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the polling Jenkins controller or agent, server-side request forgery, or denial-of-service attacks.

UJenkins RLTrigger Plugin 0.49 disables external entity resolution for its XML parser.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:urltriggerall versions0.49org.jenkins-ci.plugins:urltrigger:0.49

Affected Products

1 product · 1 configurations
Application
urltriggerjenkins
≤ 0.48
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.jenkins-ci.plugins:urltrigger, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jenkins-ci.plugins:urltrigger to 0.49 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21659 is resolved across your whole dependency graph.

  3. Workarounds

    Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

Jenkins URLTrigger Plugin 0.48 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This allows attackers with Job/Configure permission or otherwise able to control the contents of an URL to an XML document being examined for changes to have Jenkins parse a crafted XML document that uses external entities for extraction of secrets from the polling Jenkins controller or agent, server-side request forgery, or denial-of-service attacks. UJenkins RLTrigger Plugin 0.49 disables external entity resolution for its XML parser.
O3 Security · Impact-Aware SCA

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CVE-2021-21659: urltrigger SSRF — Fixed in 0.49