MSRXCVE-2026-114728
CVE-2026-114728
CVSS 3.1 · CNA · mitre.org
chance of exploitation in the next 30 days (EPSS; higher than 31% of CVEs)
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.
Scores
Affected products
- roundcube webmail: ≥ 1.6.0, < 1.6.20; ≥ 1.7.0, < 1.7.5
Weakness: CWE-184
6 references (advisories, patches, write-ups)
- https://bugs.debian.org/1151279 · Third Party Advisory, Mailing List
- https://github.com/roundcube/roundcubemail/commit/2f74267f0e13bed7182b1d2294cc4f3c5c46dcee · Patch
- https://github.com/roundcube/roundcubemail/commit/ff4fcfdd2952f9d09947cc9c18137f381f27caf1 · Patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 · Release Notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 · Release Notes
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 · Issue Tracking, Release Notes
Sources: NVD, CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.