Bug 2558796

Summary: CVE-2026-114722 roundcubemail: Roundcube Webmail: Interface spoofing via CSS scoping bypass in HTML messages [fedora-all]
Product: [Fedora] Fedora Reporter: Laura Pardo <lpardo>
Component: roundcubemailAssignee: Remi Collet <fedora>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: anon.amish, fedora, kevin, mhlavink, tm
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["fa2a89d2-26d5-4e01-ac01-8fae04e5d4ec"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2558720    

Description Laura Pardo 2026-10-22 09:31:33 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSS scoping bypass in HTML messages. rcube_utils::mod_css_styles() did not treat an at-rule prologue such as @layer a; as a selector boundary, and did not handle selectors beginning with ::, so selectors following an at-rule were left unscoped and applied to the whole Roundcube interface instead of being confined to the message body. This allows an HTML message to restyle application chrome for UI redressing and spoofing. Upstream fixed this in the commit “Fix CSS scoping bypass in HTML messages using at-rules”.
Comment 1 Fedora Update System 2026-10-27 05:36:28 UTC 
FEDORA-2026-2aba9ce8fc (roundcubemail-1.7.5-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-2aba9ce8fc
Comment 2 Fedora Update System 2026-10-28 03:45:26 UTC 
FEDORA-2026-7002464a52 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-7002464a52`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-7002464a52

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 3 Fedora Update System 2026-10-28 04:01:48 UTC 
FEDORA-2026-2aba9ce8fc has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-2aba9ce8fc`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-2aba9ce8fc

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.