CVE-2026-114727 Roundcube CVE debrief

Who should care

Defenders responsible for Roundcube Webmail installations should assess exposure and apply patches. This includes administrators and security teams managing email services, who should verify exposure by checking installed versions and review official advisories for patches.

Why it matters

CVE-2026-114727 is a high-severity vulnerability in Roundcube Webmail that allows potentially unsafe content to be passed to ImageMagick. Defenders should verify exposure and apply patches to prevent potential exploitation. This includes administrators and security teams managing email services.

• Potential exploitation could lead to unauthorized access or data breaches.
• Successful exploitation could result in lateral movement within the network.
• Verification of exposure and application of patches are crucial to prevent potential exploitation.
• Defenders should prioritize patching to prevent potential security incidents.

Technical summary

The vulnerability exists in Roundcube Webmail versions prior to 1.6.20 and 1.7.5. It allows potentially unsafe content to be passed to ImageMagick when resizing images because SVG and EPS image types were accepted. These formats can reference external resources and invoke ImageMagick delegates. The issue was fixed by removing SVG and EPS from the accepted image types. Defenders should assess exposure and apply patches to prevent potential exploitation, focusing on verifying installed versions and applying vendor guidance.

Defensive priority

Defenders should prioritize verifying exposure and applying patches to prevent potential exploitation.

Recommended defensive actions

• Verify exposure by checking if the installed version of Roundcube Webmail is prior to 1.6.20 or 1.7.5.
• Apply patches by updating to version 1.6.20 or 1.7.5.
• Restrict image uploads to only allow trusted formats.
• Monitor for suspicious image upload and processing activity.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• 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.

Evidence notes

The CVE record and source item provide details on the vulnerability, including its existence in versions prior to 1.6.20 and 1.7.5, and the fix via specific commits. Defenders should verify exposure by checking installed versions and review official advisories for patches. Evidence limits suggest focusing on confirmed affected versions and vendor guidance.

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.