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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 7
- StatusUndergoing Analysis → PublishedNVD modified 2026-10-26 16:46
- StatusPublished → Undergoing AnalysisNVD modified 2026-10-26 17:17
- StatusUndergoing Analysis → PublishedNVD modified 2026-10-22 02:02
- StatusPublished → Undergoing AnalysisNVD modified 2026-10-22 16:45
- StatusReceived → PublishedNVD modified 2026-10-22 02:02
- StatusPublished → ReceivedNVD modified 2026-10-22 02:17
- First seenCVSS 5.3 · roundcubeNVD modified 2026-10-22 02:02
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 6
- https://bugs.debian.org/1151279
- https://github.com/roundcube/roundcubemail/commit/2f74267f0e13bed7182b1d2294cc4f3c5c46dcee
- https://github.com/roundcube/roundcubemail/commit/ff4fcfdd2952f9d09947cc9c18137f381f27caf1
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5