Quick answers
- Is CVE-2026-118090 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118090 being exploited in the wild.
- How severe is CVE-2026-118090?
- High severity, with a CVSS score of 8.8, published 30 October 2026.
- Which products and versions are affected?
- StylemixThemes MasterStudy LMS 3.7.55 and earlier.
- Is there a fix for CVE-2026-118090?
- Yes: fixed in 3.7.56. Until then: As an immediate action, update the affected plugin to version 3.7.56 or later. Patchstack has issued a mitigation rule to block exploitation attempts until the update is applied. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118090 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-118090?
- 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.
How to fix
- Fixed in: 3.7.56
As an immediate action, update the affected plugin to version 3.7.56 or later. Patchstack has issued a mitigation rule to block exploitation attempts until the update is applied.
Technical details
The plugin contains a PHP object injection flaw in its subscriber-related functionality that allows authenticated users with subscriber privileges to manipulate object serialization and trigger arbitrary code execution on the server. This is an injection vulnerability (OWASP A3) requiring only subscriber-level authentication—a low privilege requirement that is easy to obtain on most WordPress installations.
Affected products
- StylemixThemes MasterStudy LMS 3.7.55 and earlier
Timeline
- 2026-10-30: disclosed
- 2026-10-30: advisory: Patchstack advisory published