CVE-2026-39845: Weblate: SSRF via the webhook add-on using unprotected fetch_url()

Severity: medium (CVSS 4.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-15 · updated 2026-10-26
Weakness: CWE-918

Description

Weblate is a web based localization tool. In versions prior to 5.17, the webhook add-on did not utilize existing SSRF protections. This issue has been fixed in version 5.17. If developers are unable to update immediately, they can disable the webhook add-on as a workaround.

Affected products

WeblateOrg weblate: before 5.17 — fixed in 5.17

How to fix

Upgrade to a fixed version: WeblateOrg weblate 5.17. Check the vendor advisory for mitigations.

References

https://github.com/WeblateOrg/weblate/pull/18815
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-f8hv-g549-hwg2

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