Vulnerability in Roundcube Webmail
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. 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- bugs.debian.org/1151279 (issue-tracking, third-party-advisory)
- github.com/roundcube/roundcubemail/commit/2f74267f0e13bed7182b1d2294cc4f3c5c46d… (patch)
- github.com/roundcube/roundcubemail/commit/ff4fcfdd2952f9d09947cc9c18137f381f27c… (patch)
- github.com/roundcube/roundcubemail/releases/tag/1.6.20 (release-notes, patch)
- github.com/roundcube/roundcubemail/releases/tag/1.7.5 (release-notes, patch)
- roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 (release-notes, vendor-advisory)
Frequently asked questions
- What is CVE-2026-114728?
- CVE-2026-114728 is a medium-severity vulnerability in Roundcube Webmail, classified under Incomplete List of Disallowed Inputs. CVSS score: 5.3/10. Published 2026-10-22.
- How severe is CVE-2026-114728?
- Medium severity. CVSS v3 base score is 5.3 out of 10.