CVE-2026-114718 Roundcube CVE debrief

Who should care

Defenders responsible for Roundcube Webmail instances, especially those using the affected versions, should assess exposure and apply patches or compensating controls. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify exposure, prioritize patching, and implement compensating controls if necessary to prevent potential script injection into the Roundcube interface.

Why it matters

Defenders should care about CVE-2026-114718 because it affects Roundcube Webmail instances, allowing potential script injection into the interface. Although evidence is limited, verifying exposure and applying patches or compensating controls is necessary to prevent potential exploitation.

• Potential script injection into the Roundcube interface
• Possible exploitation requires user interaction and a vulnerable backend
• Verification of exposure and patching priority is necessary
• Limited evidence suggests no widespread exploitation

Technical summary

The vulnerability exists in the password plugin of Roundcube Webmail, where error text from a password driver is not HTML escaped. This allows a backend with influence over that text to inject scripts into the Roundcube interface. The issue affects Roundcube Webmail instances, especially those using versions before 1.6.20 and 1.7.5, and requires defenders to assess exposure and apply patches or compensating controls to prevent potential exploitation and script injection into the interface. Upstream fixed this in the commit 'Fix XSS issue in handling of password driver error responses', which escapes the driver message before display.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Roundcube Webmail instances, especially those using the affected versions.

Recommended defensive actions

• Verify Roundcube Webmail version and apply patches to upgrade to 1.6.20 or 1.7.5
• Review password plugin configurations and ensure proper input validation
• Monitor for suspicious activity and implement compensating controls if patching is not feasible
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability. Additional details are available from source references, including Debian bug reports and Roundcube GitHub commits. Evidence is limited, and defenders should verify exposure and apply patches or compensating controls. Limited evidence suggests no widespread exploitation.

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.