# CVE-2026-44264: Weblate XSS in Markdown renderer via image attributes

Source: https://junglewise.ai/threats/cve-2026-44264-weblate-xss-in-markdown-renderer-via-image-attributes  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-07. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-44264 · Severity: medium · CVSS 4.3 · Published 2026-05-07

Weblate is a web-based platform used by organizations to manage software translation and localization. A security flaw in how the system handles user-provided comments and content could allow an attacker to inject malicious code into the interface. While the platform's security policies provide some protection, an exploit could potentially allow unauthorized modification of page content or user interactions.

Technologies: [weblate (PyPI)](https://junglewise.ai/threats/technologies/weblate). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2026-44264 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-44264 being exploited in the wild.

**How severe is CVE-2026-44264?** Medium severity, with a CVSS score of 4.3, published 7 May 2026.

**Which products and versions are affected?** weblate (PyPI) ECOSYSTEM:introduced=0,fixed=5.17.1.

**Is there a fix for CVE-2026-44264?** Yes. weblate (PyPI): upgrade to 5.17.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-44264 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-44264?** Check whether you run weblate (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- weblate (PyPI): upgrade to 5.17.1 or later

  ```sh
  pip install "weblate>=5.17.1"
  ```


## Technical details

A Cross-Site Scripting (XSS) vulnerability exists in Weblate's Markdown rendering engine due to improper neutralization of HTML attributes. Specifically, the renderer failed to escape image source (src) URLs before interpolating them into generated HTML tags. An authenticated attacker with permissions to post comments or provide content could exploit this to perform attribute injection. While Weblate's Content Security Policy (CSP) provides a layer of mitigation, the flaw allows for unauthorized integrity changes to the web page. The issue is resolved in version 5.17.1 by ensuring all image targets are explicitly escaped before being processed by the mistletoe library.

## Affected products

- WeblateOrg Weblate < 5.17.1

## Identifiers

- CVE-2026-44264
- GHSA-5cmv-3rc4-7279
- PYSEC-2026-2319

## Timeline

- 2026-04-27: patched: Fix committed to repository
- 2026-04-30: advisory: GitHub Security Advisory published
- 2026-05-07: disclosed: CVE published to NVD

## References

- [https://github.com/WeblateOrg/weblate/commit/85abc9df88b7464f4c0e794aef752e45f4230f75](https://github.com/WeblateOrg/weblate/commit/85abc9df88b7464f4c0e794aef752e45f4230f75)
- [https://github.com/WeblateOrg/weblate/pull/19259](https://github.com/WeblateOrg/weblate/pull/19259)
- [https://github.com/WeblateOrg/weblate/releases/tag/weblate-5.17.1](https://github.com/WeblateOrg/weblate/releases/tag/weblate-5.17.1)
- [https://github.com/WeblateOrg/weblate/security/advisories/GHSA-5cmv-3rc4-7279](https://github.com/WeblateOrg/weblate/security/advisories/GHSA-5cmv-3rc4-7279)

## Related threats

- [Weblate IDOR in GroupViewSet authorization bypass](https://junglewise.ai/threats/cve-2026-55228-weblate-idor-in-groupviewset-authorization-bypass)
- [Weblate observable object existence disclosure via HTTP status codes](https://junglewise.ai/threats/cve-2026-55227-weblate-observable-object-existence-disclosure-via-http-status)
- [PYSEC-2026-2037 - Weblate leaks information via screenshots](https://junglewise.ai/threats/cve-2026-21889-weblate-information-disclosure-via-unprotected-screenshots)
- [PYSEC-2026-2040 - Weblate has an arbitrary file read via symbolic links](https://junglewise.ai/threats/cve-2025-68279-weblate-has-an-arbitrary-file-read-via-symbolic-links)
- [PYSEC-2026-2036 - Weblate has a long session expiry when verifying second factor](https://junglewise.ai/threats/cve-2025-58352-weblate-weak-session-expiry-during-second-factor-verification)