CVE-2026-114728

MEDIUM 5.3

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-184
Vendor	roundcube
Product	webmail
Published	Oct 22, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

Roundcube / Webmail

1.6.0 < 1.6.20 1.7.0 < 1.7.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugs.debian.org: https://bugs.debian.org/1151279 github.com: https://github.com/roundcube/roundcubemail/commit/2f74267f0e13bed7182b1d2294cc4f3c5c46dcee roundcube.net: https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 github.com: https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 github.com: https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 github.com: https://github.com/roundcube/roundcubemail/commit/ff4fcfdd2952f9d09947cc9c18137f381f27caf1