CVE-2026-114728

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{"bugzilla": {"description": "roundcubemail: roundcubemail: Remote content blocking bypass via crafted CSS escape sequences", "id": "2558739", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558739"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-184", "details": ["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 \u201cFix remote content blocking bypass via CSS escapes in FuncIRI attributes (again)\u201d, which resolves CSS escapes before matching and also inspects the `to`, `from` and `by` attributes.", "A flaw was found in Roundcube Webmail. The HTML message sanitizer fails to properly normalize all valid CSS escape sequences when inspecting external resource attributes. A remote attacker can exploit this flaw by sending a crafted email that bypasses remote content blocking, causing external content to load automatically without user consent and resulting in information disclosure."], "name": "CVE-2026-114728", "public_date": "2026-10-22T02:02:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-114728\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-114728\nhttps://bugs.debian.org/1151279\nhttps://github.com/roundcube/roundcubemail/commit/2f74267f0e13bed7182b1d2294cc4f3c5c46dcee\nhttps://github.com/roundcube/roundcubemail/commit/ff4fcfdd2952f9d09947cc9c18137f381f27caf1\nhttps://github.com/roundcube/roundcubemail/releases/tag/1.6.20\nhttps://github.com/roundcube/roundcubemail/releases/tag/1.7.5\nhttps://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5"], "statement": "This flaw is rated as Moderate severity rather than Important because successful exploitation is confined to unauthorized retrieval of external web resources, resulting in limited information exposure without code execution or database compromise. In standard Red Hat Enterprise Linux environments, Roundcube Webmail is not distributed as a supported core product and is only packaged through community repositories such as EPEL. The issue occurs when the webmail sanitizer fails to process obfuscated styling tokens, which allows incoming messages to circumvent client privacy safeguards and trigger outbound network requests upon display.", "threat_severity": "Moderate"}

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