CVE-2026-35544

unknown

Published 2026-04-03 · Modified 2026-04-04

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to a fixed-position mitigation bypass via the use of !important.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`1.6.15+dfsg-0+deb13u1`
sid	Fixed	`1.6.14+dfsg-1`
forky	Fixed	`1.6.14+dfsg-1`
bullseye	Fixed	`1.4.15+dfsg.1-1+deb11u8`
bookworm	Fixed	`1.6.5+dfsg-1+deb12u8`

Package impact

Ecosystem	Package	Vulnerable	Fixed
Packagist	roundcube/roundcubemail	`>=1.7-beta,<1.7-rc5`	`1.7-rc5`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.