What is CVE-2026-42150?

CVE-2026-42150 is a medium-severity vulnerability in Weblate Wlc, classified under Cross-site Scripting. CVSS score: 5.1/10. Published 2026-05-08.

How severe is CVE-2026-42150?

Medium severity. CVSS v3 base score is 5.1 out of 10.

XSS in Weblate Wlc

CVE-2026-42150

wlc is a Weblate command-line client using Weblate's REST API. Prior to version 2.0.0, the HTML output format in wlc embeds API response data into HTML without escaping, allowing cross-site scripting when the output is rendered in a browser. This issue has been patched in version 2.0.0.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-05-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (7.1th percentile), scored 2026-09-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weblate Wlc
Weblateorg Wlc — versions < 2.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/WeblateOrg/wlc/security/advisories/GHSA-gx2m-mcc2-r4p3 (Vendor Advisory)
github.com/WeblateOrg/wlc/pull/1327 (Patch, Issue Tracking)
github.com/WeblateOrg/wlc/commit/0f3e58f6d7457b05d48ef40f579a172c4c8b8469 (Patch)
github.com/WeblateOrg/wlc/releases/tag/2.0.0 (Release Notes)

Frequently asked questions

What is CVE-2026-42150?: CVE-2026-42150 is a medium-severity vulnerability in Weblate Wlc, classified under Cross-site Scripting. CVSS score: 5.1/10. Published 2026-05-08.
How severe is CVE-2026-42150?: Medium severity. CVSS v3 base score is 5.1 out of 10.