Simply Schedule Appointments <= 1.6.12.27 - Authenticated (Subscriber+) Local File Inclusion via 'ssa_locale' Parameter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89294
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-30 07:16:30 UTC
Updated2026-09-30 16:19:22 UTC
DescriptionThe Simply Schedule Appointments plugin for WordPress is vulnerable to Local File Inclusion in all versions up to, and including, 1.6.12.27 via the 'ssa_locale' parameter parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to include and execute arbitrary .php files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where .php file types can be uploaded and included. Notably, exploitation does not require authentication in practice, as the locale filter is installed unconditionally on every request during plugins_loaded and the callback performs no nonce or capability check before returning the raw GET parameter value.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-98 | CWE-98 CWE-98 Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Croixhaug Simply Schedule Appointments affected 1.6.12.27 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.12.27/includes/... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/aab8f2ae-993b-4893-81cc-1b8a1... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: crow (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-09-11T13:05:16.000ZVendor Notified
CNA2026-09-29T18:05:39.000ZDisclosed

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