CVE-2026-52837 alextselegidis CVE debrief

Who should care

Users of Easy!Appointments versions up to 1.5.2, particularly those managing customer appointments, should be aware of this vulnerability and take steps to protect their customers' data by upgrading to version 1.6.0 or later and implementing additional security measures.

Technical summary

The booking reschedule view at `/index.php/booking/reschedule/{appointment_hash}` in Easy!Appointments versions up to 1.5.2 embeds the entire customer record as inline JavaScript without authentication or field whitelisting. This allows anyone with the 12-character `appointment_hash` to read every column of the corresponding customer's row in the `ea_users` table. The vulnerability is addressed in version 1.6.0.

Defensive priority

Medium

Recommended defensive actions

• Upgrade to version 1.6.0 or later
• Limit access to appointment hashes
• Monitor for suspicious activity
• Implement additional security measures to protect customer data
• 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 was published on 2026-07-14T15:17:04.170Z and last modified on 2026-07-21T19:17:10.830Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify affected Easy!Appointments deployments and review customer data exposure.

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.