What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-17 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• wger-project wger: before 2.5 — fixed in 2.5

How to fix

Upgrade to a fixed version: wger-project wger 2.5. Check the vendor advisory for mitigations.

References

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

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