GHSA-255w-87rh-rg44 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in sulu/sulu. A fix is available for sulu/sulu — see the affected versions and patch details below.
Cross-site Scripting via uploaded SVG
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 GHSA-255w-87rh-rg44.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-255w-87rh-rg44 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,156 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
sulu/sulu🐘sulu/suluReal-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 a PHP content management system. Sulu is vulnerable against XSS whereas a low privileged user with access to the “Media” section can upload an SVG file with a malicious payload. Once uploaded and accessed, the malicious javascript will be executed on the victims’ (other users including admins) browsers. This issue is fixed in 2.6.5.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | sulu/sulu | ≥ 2.0.0-RC1&&< 2.5.21 | 2.5.21composer require sulu/sulu:^2.5.21 |
| 🐘Packagist | sulu/sulu | ≥ 2.6.0-RC1&&< 2.6.5 | 2.6.5composer require sulu/sulu:^2.6.5 |
Detection & mitigation playbook
Open-source dependencyDetect
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.
Fix
Update sulu/sulu to 2.5.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-255w-87rh-rg44 is resolved across your whole dependency graph.
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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-255w-87rh-rg44 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-255w-87rh-rg44. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-255w-87rh-rg44 in your dependencies?
O3 Security finds GHSA-255w-87rh-rg44 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.