Microweber vulnerable to stored cross-site scripting (XSS) via X-Forwarded-For headerGHSA-hhjm-mpmf-cxg9
HIGHFix: microweber/microweber@8d039deGHSA-hhjm-mpmf-cxg9 is a high-severity (CVSS 7.4) Cross-site Scripting (XSS) vulnerability in microweber/microweber. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for microweber/microweber — see the affected versions and patch details below.
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA’s SSVC triage for GHSA-hhjm-mpmf-cxg9.
EPSS Exploitation Probability
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
microweber/microweberReal-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
microweber/microweber prior to 1.3.3 is vulnerable to stored cross-site scripting (XSS) via the X-Forwarded-For header. This was fixed in version 1.3.3.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | microweber/microweber | all versions | 1.3.3composer require microweber/microweber:^1.3.3 |
Affected Products
microwebermicroweberResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for microweber/microweber, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update microweber/microweber to 1.3.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hhjm-mpmf-cxg9 is resolved across your whole dependency graph.
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
Is GHSA-hhjm-mpmf-cxg9 in your dependencies?
Find it across Packagist, including transitive dependencies.