What is CVE-2026-21889?

CVE-2026-21889 is a high-severity vulnerability in Weblate, classified under Improper Access Control. CVSS score: 7.5/10. Published 2026-01-14.

How severe is CVE-2026-21889?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Weblate

CVE-2026-21889

Weblate is a web based localization tool. Prior to 5.15.2, the screenshot images were served directly by the HTTP server without proper access control. This could allow an unauthenticated user to access screenshots after guessing their filename. This vulnerability is fixed in 5.15.2.

Published 2026-01-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (29.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.2% 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: 0.004 · change: +0.000

Affected products

Weblate
Weblateorg Weblate — versions < 5.15.2

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

github.com/WeblateOrg/weblate/security/advisories/GHSA-3g2f-4rjg-9385 (Patch, Vendor Advisory)
github.com/WeblateOrg/weblate/pull/17516 (Issue Tracking)
github.com/WeblateOrg/weblate/commit/a6eb5fd0299780eca286be8ff187dc2d10feec47 (Patch)

Frequently asked questions

What is CVE-2026-21889?: CVE-2026-21889 is a high-severity vulnerability in Weblate, classified under Improper Access Control. CVSS score: 7.5/10. Published 2026-01-14.
How severe is CVE-2026-21889?: High severity. CVSS v3 base score is 7.5 out of 10.