CVE-2026-42150 json
wlc: print_html outputs API data without HTML escaping, enabling stored XSS
published 2026-04-24 6 mo ago modified 2026-10-26 13 d ago also GHSA-gx2m-mcc2-r4p3 , PYSEC-2026-2321 , EUVD-2026-28501
- cvss
- 5.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 6%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi wlc 2.0.0
- weblate wlc 2.0.0
- wlc Debian 14 2.0.0-1
debian advisories DEBIAN-CVE-2026-42150
- github.com/WeblateOrg/wlc@0f3e58f commit
- github.com/WeblateOrg/wlc#1327 pull request
- github.com/WeblateOrg/wlc/releases/tag/2.0.0 release
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.1 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L |
| NVD | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 5.1 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L |
| OSV | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | wlc | <2.0.0 |
2.0.0 |
Affected products
- WeblateOrg wlc
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/WeblateOrg/wlc/pull/1327
web, issue-tracking, patch
-
github.com
/WeblateOrg/wlc/commit/0f3e58f6d7457b05d48ef40f579a172c4c8b8469
web, patch
-
github.com
/WeblateOrg/wlc/security/advisories/GHSA-gx2m-mcc2-r4p3
web, vendor-advisory, advisory
-
github.com
/WeblateOrg/wlc/releases/tag/2.0.0
web, release-notes, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-42150
advisory
-
github.com
/WeblateOrg/wlc
package
Sources
- CVE List CVE-2026-42150
- GitHub Advisory GHSA-gx2m-mcc2-r4p3
- NVD CVE-2026-42150
- OSV PYSEC-2026-2321
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.