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CRITICAL severity

CVE-2021-21669 — generic-webhook-trigger

CRITICALFix: jenkinsci/generic-webhook-trigger-plugin@da434df

CVE-2021-21669 is a critical-severity (CVSS 9.8) vulnerability in org.jenkins-ci.plugins:generic-webhook-trigger. EPSS puts its 30-day exploitation probability at 25.7% (98th percentile). A fix is available for org.jenkins-ci.plugins:generic-webhook-trigger — see the affected versions and patch details below.

XXE vulnerability in Jenkins Generic Webhook Trigger Plugin

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
25.7%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
0.00%11.1%22.3%33.4%0.2%25.7%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:generic-webhook-trigger

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 Generic Webhook Trigger Plugin 1.72 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.

This allows attackers with the ability to call webhooks configured to extract parameters using XPath to have Jenkins parse a crafted XML request body that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.

Jenkins Generic Webhook Trigger Plugin 1.74 disables external entity resolution for its XML parser.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.plugins:generic-webhook-triggerall versions1.74org.jenkins-ci.plugins:generic-webhook-trigger:1.74

Affected Products

1 product · 1 configurations
Application
generic webhook triggerjenkins
≤ 1.72
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:generic-webhook-trigger, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jenkins-ci.plugins:generic-webhook-trigger to 1.74 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-21669 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 Generic Webhook Trigger Plugin 1.72 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This allows attackers with the ability to call webhooks configured to extract parameters using XPath to have Jenkins parse a crafted XML request body that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery. Jenkins Generic Webhook Trigger Plugin 1.74 disables external entity resolution for its XML parser.
O3 Security · Impact-Aware SCA

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CVE-2021-21669: generic-webhook SSRF — Fixed in 1.74