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Not in CISA KEV
MEDIUM severity

Weblate vulnerable to XSS via crafted MarkdownGHSA-5cmv-3rc4-7279

MEDIUMFix: WeblateOrg/weblate#19259

GHSA-5cmv-3rc4-7279 is a medium-severity (CVSS 4.3) CWE-80 vulnerability in weblate. A fix is available for weblate — see the affected versions and patch details below.

Also known asCVE-2026-44264PYSEC-2026-2319
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-5cmv-3rc4-7279.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs20th percentile — riskier than 20% of all scored CVEsHighest risk
0.00%0.29%0.58%0.87%0.0%0.3%Jun 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍weblate

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

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 Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIweblateall versions5.17.1pip install --upgrade 'weblate==5.17.1'

Affected Products

1 product · 1 configurations
Application
weblateweblate
< 5.17.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for weblate, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update weblate to 5.17.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5cmv-3rc4-7279 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact The Markdown renderer used in user comments and other user-provided content didn't properly sanitize some attributes. ### Patches * https://github.com/WeblateOrg/weblate/pull/19259 ### 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.
O3 Security · Impact-Aware SCA

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Weblate vulnerable to XSS via crafted Markdown