Is CVE-2026-78284 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-78284 being exploited in the wild.

How severe is CVE-2026-78284?

High severity, with a CVSS score of 8.6, published 24 August 2026.

Which products and versions are affected?

StylemixThemes MasterStudy LMS <=3.7.42.

Is there a fix for CVE-2026-78284?

A patch was published on 2026-08-24: version 3.7.43 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-78284 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-78284?

Check whether you run StylemixThemes MasterStudy LMS 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-2026-78284: MasterStudy LMS unauthenticated arbitrary file deletion

Q: Is there a fix for CVE-2026-78284?

A patch was published on 2026-08-24: version 3.7.43 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-78284 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-78284?

Check whether you run StylemixThemes MasterStudy LMS 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-2026-78284 · Severity: high · CVSS 8.6 · Published 2026-08-24

MasterStudy LMS is a WordPress learning management system plugin used to deliver online courses. An unauthenticated attacker can delete arbitrary files from an affected website, causing data loss and complete site outage. This requires no authentication, meaning any internet user can exploit it.

Technologies: StylemixThemes MasterStudy LMS. Vendors: StylemixThemes.

Quick answers

Is CVE-2026-78284 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-78284 being exploited in the wild.
How severe is CVE-2026-78284?: High severity, with a CVSS score of 8.6, published 24 August 2026.
Which products and versions are affected?: StylemixThemes MasterStudy LMS <=3.7.42.
Is there a fix for CVE-2026-78284?: A patch was published on 2026-08-24: version 3.7.43 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-78284 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-78284?: Check whether you run StylemixThemes MasterStudy LMS 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 is an unauthenticated arbitrary file deletion vulnerability in MasterStudy LMS affecting versions 3.7.42 and earlier. The root cause involves a broken access control flaw (OWASP A1) that fails to properly validate user privileges before allowing file deletion operations. An attacker can send specially crafted requests over the network to delete critical files without any authentication or user interaction. This enables complete compromise of site availability and potential data destruction. The vulnerability was patched in version 3.7.43.

Affected products

StylemixThemes MasterStudy LMS <=3.7.42

Timeline

2026-08-24: disclosed
2026-08-24: patched: version 3.7.43

References

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