Weblate: Privilege escalation in the user API endpoint

published 2026-04-15 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-23005 , GHSA-3382-gw9x-477v , PYSEC-2026-155

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits: 0; none known

Weblate is a web based localization tool. In versions prior to 5.17, the user patching API endpoint didn't properly limit the scope of edits. This issue has been fixed in version 5.17.

Patch / fix

fixed in 2 links 1

pypi weblate 5.17
weblate weblate 5.17

github.com/WeblateOrg/weblate#18687 pull request

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 6 mo ago (2026-04-15)

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
OSV	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	weblate	<5.17	5.17

Affected products

WeblateOrg weblate

Classification

Weakness

CWE-269 Improper Privilege Management

References

github.com /WeblateOrg/weblate/pull/18687
web, issue-tracking, patch
github.com /WeblateOrg/weblate/security/advisories/GHSA-3382-gw9x-477v
web, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-34393
advisory
github.com /WeblateOrg/weblate
package
github.com /pypa/advisory-database/tree/main/vulns/weblate/PYSEC-2026-155.yaml
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary