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Medium

Weblate vulnerable to XSS via crafted Markdown

  • Disclosed: 07.05.2026
  • Updated: 11.10.2026 14:17

Impact

The Markdown renderer used in user comments and other user-provided content didn't properly sanitize some attributes.

Patches

Workarounds

Even though the attacker might be able to inject code into the HTML, the Weblate's strict CSP should mitigate the risks.

Acknowlegement

Michal Čihař has identified and fixed this vulnerability.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) weblate < 5.17.1 5.17.1

References

CVSS score 4.3/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE)
CWE-79, CWE-80
Platform
Python (PyPI)
Package
weblate
Disclosed
07.05.2026
Updated
11.10.2026 14:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2319 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-5cmv-3rc4-7279 - CC BY 4.0

Vulnerability history: weblate

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (36) in the archive
Total entries
36
First → latest
03.2017 08.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 6
  • Medium 22
  • Low 7

Disclosures per year

Severity:
  1. Weblate has IDOR in GroupViewSet that allows authenticated project manager to gain unauthorized read access to any private project
    High · 8.1 CVE-2026-55228 < 2026.7 2026.7
  2. Weblate vulnerable to XSS via crafted Markdown this entry
    Medium · 4.3 CVE-2026-44264 < 5.17.1 5.17.1
  3. Weblate: Privilege escalation in the user API endpoint
    High · 8.8 CVE-2026-34393 < 5.17 5.17
  4. Weblate: Arbitrary File Read via Symlink
    High · 7.7 CVE-2026-34242 < 5.17 5.17
  5. Weblate: Remote code execution during backup restoration
    High · 8.0 CVE-2026-33435 < 5.17 5.17
  6. Weblate is vulnerable to RCE through Git config file overwrite
    Critical · 9.1 CVE-2025-68398 < 5.15.1 5.15.1
  7. Weblate has an arbitrary file read via symbolic links
    High · 7.7 CVE-2025-68279 < 5.15.1 5.15.1
  8. Weblate is a web based localization tool. Prior to version 5.11, when creating a new component from an existing component that has a source code repository URL specified in settings, this URL is inclu
    High · 7.5 CVE-2025-32021 < 5.11 5.11

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