CVE-2026-114721 Roundcube CVE debrief

Who should care

Defenders responsible for Roundcube Webmail installations, particularly those with remote authenticated users, should assess exposure and apply patches. They should also review and update the disabled_actions configuration setting and monitor for potential exploitation attempts. Additionally, defenders should verify the version of Roundcube Webmail and apply patches for versions before 1.6.20 and 1.7.5.

Why it matters

CVE-2026-114721 allows remote authenticated attackers to bypass disabled_actions in Roundcube Webmail, potentially leading to unauthorized actions.

• Verify and apply patches for vulnerable Roundcube Webmail versions
• Review and update disabled_actions configuration setting
• Monitor for potential exploitation attempts

Technical summary

The vulnerability allows a remote authenticated attacker to bypass the disabled_actions configuration setting in Roundcube Webmail by requesting an action through its deprecated alias. The fix involves moving the check into rcmail::action_handler() and resolving aliases before comparing. This issue arises from the check comparing only the action name as requested, so a remote authenticated attacker could reach an action listed in disabled_actions by requesting it through its deprecated alias instead. Upstream fixed this in the commit 'Fix bug where deprecated action aliases bypassed `disabled_actions` setting'.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Roundcube Webmail versions before 1.6.20 and 1.7.5.

Recommended defensive actions

• Verify Roundcube Webmail version and apply patches for versions before 1.6.20 and 1.7.5
• Review and update disabled_actions configuration setting
• Monitor for potential exploitation attempts
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and fixed versions. However, there is limited information on potential exploitation or impact. The vulnerability allows a remote authenticated attacker to bypass the disabled_actions configuration setting in Roundcube Webmail by requesting an action through its deprecated alias. The fix involves moving the check into rcmail::action_handler() and resolving aliases before comparing. There are no known instances of this CVE

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.