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Vulnerability record · CVE-2026-13764 · published 12 November 2026

CVE-2026-13764: Missing authorization vulnerability

The Masterstudy - Education WordPress Theme theme for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.8.151. This is due to missing authorization and nonce validation on the `masterstudy_ms_stm_set_discard_transient` AJAX action. This makes it possible for authenticated attackers, with Subscriber-level access and above, to elevate their privileges to Administrator by setting the `stm_developer_access_token` transient and using the developer access auto-login flow to obtain administrator session cookies.

8.8 CVSS 3.1 High CWE-862 · Missing authorization Deferred
8.8CVSS 3.1 base score
-EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
12 Nov 2026Last modified by NVD

Description

The Masterstudy - Education WordPress Theme theme for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.8.151. This is due to missing authorization and nonce validation on the `masterstudy_ms_stm_set_discard_transient` AJAX action. This makes it possible for authenticated attackers, with Subscriber-level access and above, to elevate their privileges to Administrator by setting the `stm_developer_access_token` transient and using the developer access auto-login flow to obtain administrator session cookies.

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

References

LinkTags
https://docs.stylemixthemes.com/masterstudy-theme-documentation/extra-materials/changelog
https://themeforest.net/item/masterstudy-education-center-wordpress-theme/12170274
https://www.wordfence.com/threat-intel/vulnerabilities/id/ec898f73-d275-4624-911b-89d9a945ff92?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-13764), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.