Is CVE-2026-13764 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-13764 being exploited in the wild.

How severe is CVE-2026-13764?

High severity, with a CVSS score of 8.8, published 12 November 2026.

Which products and versions are affected?

StylemixThemes Masterstudy - Education WordPress Theme up to and including 4.8.151.

Is there a fix for CVE-2026-13764?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-13764 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-13764?

Check whether you run StylemixThemes Masterstudy - Education WordPress Theme at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-13764: Masterstudy Education WordPress Theme privilege escalation in AJAX action

CVE-2026-13764 · Severity: high · CVSS 8.8 · Published 2026-11-12

The Masterstudy Education WordPress Theme, used to build online learning platforms, contains a flaw that allows low-privilege users to become administrators. An authenticated attacker with a basic Subscriber account can exploit a missing security check on an AJAX action to gain full administrative control over the website, potentially leading to data theft, site takeover, or deployment of malicious content.

Vendors: StylemixThemes.

Quick answers

Is CVE-2026-13764 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-13764 being exploited in the wild.
How severe is CVE-2026-13764?: High severity, with a CVSS score of 8.8, published 12 November 2026.
Which products and versions are affected?: StylemixThemes Masterstudy - Education WordPress Theme up to and including 4.8.151.
Is there a fix for CVE-2026-13764?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-13764 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-13764?: Check whether you run StylemixThemes Masterstudy - Education WordPress Theme at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability exists in the `masterstudy_ms_stm_set_discard_transient` AJAX action, which lacks authorization and nonce validation. An authenticated attacker can set the `stm_developer_access_token` transient and trigger the developer auto-login flow to obtain administrator session cookies. This requires authentication but no special preconditions beyond Subscriber-level access.

Affected products

StylemixThemes Masterstudy - Education WordPress Theme up to and including 4.8.151

Timeline

2026-11-12: disclosed

References

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