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PatchSiren cyber security CVE debrief

CVE-2026-39663 themetechmount CVE debrief

A Missing Authorization vulnerability was found in the TrueBooker truebooker-appointment-booking plugin. This issue affects TrueBooker from n/a through version 1.1.5. The vulnerability allows Exploiting Incorrectly Configured Access Control Security Levels, with a CVSS score of 5.3 and a severity of MEDIUM. The CVE record was published on 2026-04-08T09:16:37.490Z and last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Deferred. Users of the TrueBooker truebooker-appointment-booking plugin should be aware of this vulnerability and take necessary actions to mitigate the risk.

Vendor
themetechmount
Product
TrueBooker
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Users of the TrueBooker truebooker-appointment-booking plugin, security teams, and operators should be aware of this vulnerability and take necessary actions to mitigate the risk. Affected deployments should be identified and owners assigned for follow-up.

Technical summary

The CVE-2026-39663 vulnerability is caused by a Missing Authorization issue in the TrueBooker truebooker-appointment-booking plugin. This allows attackers to exploit incorrectly configured access control security levels. The vulnerability has a CVSS score of 5.3 and a severity of MEDIUM. It affects TrueBooker from n/a through version 1.1.5.

Defensive priority

MEDIUM

Recommended defensive actions

  • Inventory and verify the version of TrueBooker truebooker-appointment-booking plugin in use
  • Apply the latest patch or update to version 1.1.6 or later if available
  • Monitor for suspicious activity related to the plugin
  • Consider implementing compensating controls to restrict access to the plugin
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record was published on 2026-04-08T09:16:37.490Z and last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Deferred. The vulnerability affects TrueBooker from n/a through version 1.1.5, allowing Exploiting Incorrectly Configured Access Control Security Levels. Users should verify the version of TrueBooker truebooker-appointment-booking plugin in use and monitor for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-39663 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-39663

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-39663 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-39663

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

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.