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Advisory record · GHSA-xpqh-grpw-4xmg

Roundcube Webmail: Insufficient CSS sanitization in HTML e-mail messages

CVSS 5.3 MediumEPSS 0.0038 · 32nd percentile

Published by the GitHub Advisory Database at 3 Apr 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
roundcube/roundcubemailPackagist>=1.7-beta, <1.7-rc51.7-rc5
Identifiers
GHSA-xpqh-grpw-4xmg · CVE-2026-35544 · PKSA-wvxn-8qzx-v8n9
Weakness (CWE)
CWE-669
Tags
Published
3 Apr 2026
Updated
4 Apr 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Roundcube Webmail from 1.7-beta before 1.7-rc5 is affected, according to the package record. Insufficient CSS sanitization in HTML e-mail messages allows a fixed-position mitigation to be bypassed using !important, and the source gives few details on the impact. Upgrade to 1.7-rc5; the description also lists 1.5.14 and 1.6.14 as fixes for earlier branches.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CNA (mitre)
  • CISA KEV Not listed.
  • EPSS 0.0038, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:25 UTC First seen by agentprime
  2. 31 Oct 2026, 14:25 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.