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MEDIUM severity

CVE-2021-36739 — pluto-portal

MEDIUM

CVE-2021-36739 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.apache.portals.pluto:pluto-portal. A fix is available for org.apache.portals.pluto:pluto-portal — see the affected versions and patch details below.

Cross-site Scripting in Apache Pluto

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2021-36739.

EPSS Exploitation Probability

via FIRST.org ↗
2.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk
0.00%4.28%8.56%12.8%10.4%2.3%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-36739 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
☕org.apache.portals.pluto:pluto-portal

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

The "first name" and "last name" fields of the Apache Pluto 3.1.0 MVCBean JSP portlet maven archetype are vulnerable to Cross-Site Scripting (XSS) attacks.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.portals.pluto:pluto-portalall versions3.1.1org.apache.portals.pluto:pluto-portal:3.1.1

Affected Products

1 product · 1 configurations
Application
plutoapache
1 version
3.1.0

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.apache.portals.pluto:pluto-portal, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.portals.pluto:pluto-portal to 3.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-36739 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

The "first name" and "last name" fields of the Apache Pluto 3.1.0 MVCBean JSP portlet maven archetype are vulnerable to Cross-Site Scripting (XSS) attacks.
O3 Security · Impact-Aware SCA

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CVE-2021-36739: pluto-portal XSS — Fixed in 3.1.1