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MEDIUM severity

CVE-2021-32737 — sulu

MEDIUM

CVE-2021-32737 is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in sulu/sulu. A fix is available for sulu/sulu — see the affected versions and patch details below.

XSS Injection in Media Collection Title was possible

Also known asGHSA-gm2x-6475-g9r8
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs50th percentile — riskier than 50% of all scored CVEsHighest risk
0.00%0.39%0.78%1.17%0.4%0.7%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-32737 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 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
🐘sulu/sulu

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

Description

Sulu is an open-source PHP content management system based on the Symfony framework. In versions of Sulu prior to 1.6.41, it is possible for a logged in admin user to add a script injection (cross-site-scripting) in the collection title. The problem is patched in version 1.6.41. As a workaround, one may manually patch the affected JavaScript files in lieu of updating.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsulu/suluall versions1.6.41composer require sulu/sulu:^1.6.41

Affected Products

1 product · 1 configurations
Application
sulusulu
< 1.6.41
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 sulu/sulu, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update sulu/sulu to 1.6.41 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-32737 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

Sulu is an open-source PHP content management system based on the Symfony framework. In versions of Sulu prior to 1.6.41, it is possible for a logged in admin user to add a script injection (cross-site-scripting) in the collection title. The problem is patched in version 1.6.41. As a workaround, one may manually patch the affected JavaScript files in lieu of updating.
O3 Security · Impact-Aware SCA

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CVE-2021-32737: sulu — Fixed in 1.6.41