Vulnerability record
CVE-2026-13764
The short answer
CVE-2026-13764 affects StylemixThemes Masterstudy - Education WordPress Theme and is rated high (CVSS 8.8). It is not in CISA's Known Exploited Vulnerabilities catalog.
What it is
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.
Weakness: CWE-862.
Severity
8.8 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
No score
FIRST scores CVEs within a day of publication
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Affected products
Masterstudy - Education WordPress Theme. NVD's record lists the exact affected versions.
References
Questions
Is CVE-2026-13764 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-12.
How do I fix CVE-2026-13764?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Deferred. The description is NVD's text, quoted as published.
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