CVE-2026-61343 LibreBooking CVE debrief

Who should care

Administrators and users of LibreBooking, especially those with administrator credentials, should be aware of this vulnerability and take steps to mitigate it. This includes updating to version 5.1.0 or later, restricting access to the email template editor, and monitoring for suspicious activity. The vulnerability can have a significant impact on the security of the affected systems, and therefore, it is essential for the administrators and users to take necessary precautions to prevent exploitation.

Technical summary

The email template editor save action in LibreBooking passes the submitted template name directly into the destination file path, allowing a remote attacker with administrator credentials to write an arbitrary file outside the template directory and execute code. This vulnerability was fixed in version 5.1.0. The vulnerability allows for arbitrary file writes and code execution, which can lead to a high impact on the affected systems.

Defensive priority

Administrators using LibreBooking should prioritize updating to version 5.1.0 or later to address the arbitrary file write vulnerability.

Recommended defensive actions

• Update LibreBooking to version 5.1.0 or later
• Restrict access to the email template editor to authorized personnel only
• Monitor for suspicious activity related to file writes outside the template directory
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further investigation is needed to fully understand the scope of the vulnerability and potential impact. The email template editor save action in LibreBooking passes the submitted template name directly into the destination file path, allowing a remote attacker with administrator credentials to write an arbitrary file outside the template directory and execute code. The vulnerability was fixed in version 5.1.0. Administrators and users of LibreBooking, especially those with administrator credentials, should be aware of this vulnerability and take steps to mitigate it. The CVE record was published on 2026-07-09T18:16:58.030Z and has not been modified since then.

Official resources