Algernon Cross-Site Scripting vulnerabilityGHSA-8jqm-8qm3-qgqm
Fix: xyproto/algernon@cd88320GHSA-8jqm-8qm3-qgqm is a Cross-site Scripting (XSS) vulnerability in github.com/xyproto/algernon. A fix is available for github.com/xyproto/algernon — 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.
Exploitation and automatability from CISA’s SSVC triage for GHSA-8jqm-8qm3-qgqm.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
Real-World Exposure
github.com/xyproto/algernonReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Cross-site Scripting vulnerability in Algernon v1.17.4 allows attackers to execute arbitrary code via injecting a crafted payload into a filename.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/xyproto/algernon | all versions | 1.17.5go get github.com/xyproto/algernon@v1.17.5 |
Affected Products
algernonalgernon_projectDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/xyproto/algernon, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/xyproto/algernon to 1.17.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-8jqm-8qm3-qgqm 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-8jqm-8qm3-qgqm in your dependencies?
Find it across Go, including transitive dependencies.