What is CVE-2026-39845?

CVE-2026-39845 is a medium-severity vulnerability in Weblate, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.1/10. Published 2026-04-15.

How severe is CVE-2026-39845?

Medium severity. CVSS v3 base score is 4.1 out of 10.

SSRF in Weblate

CVE-2026-39845

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-04-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001

Affected products

Weblate
Weblateorg Weblate — versions < 5.17

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/WeblateOrg/weblate/security/advisories/GHSA-f8hv-g549-hwg2 (Third Party Advisory)
github.com/WeblateOrg/weblate/pull/18815 (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-39845?: CVE-2026-39845 is a medium-severity vulnerability in Weblate, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.1/10. Published 2026-04-15.
How severe is CVE-2026-39845?: Medium severity. CVSS v3 base score is 4.1 out of 10.