Vulnerability · CVE-2026-78175
Themeum tutor_lms Deserialization of Untrusted Data
Published Oct 13, 2026 · corrected/updated Oct 13, 2026 · Themeum tutor_lms · evidence confidence very high
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.0.7 via the parameter of the AJAX handler. This is due to the handler lacking any capability or role check, relying solely on a nonce, while also passing attacker-supplied values through , which replaces every character with a 66-byte HMAC placeholder token before the data is serialized and stored via ; when the meta is later retrieved, the placeholder is collapsed back to a single , leaving serialized string length declarations 65 bytes greate
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-78175 is a unknown public vulnerability record for Themeum tutor_lms. CISA lists it as known exploited. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether Themeum tutor_lms is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: Themeum tutor_lms. Published remediation guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: EPSS 1.1%. CISA lists it as known exploited. Sources contributing to this record: cve_org, epss, vulncheck_kev. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Oct 13, 2026. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 13, 2026 · VulnCheck KEV
Detected
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.0.7 via the parameter of the AJAX handler. This is due to the handler lacking any capability or role check, relying solely on a nonce, while also passing attacker-supplied values through , which replaces every character with a 66-byte HMAC placehol
Oct 13, 2026 · CISA KEV
Known exploited
Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected
- vendor Themeum tutor_lmsversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-78175
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-78175
30-day exploitation probability 1.1%
first.org - VulnCheck KEVConfirmed exploitationCVE-2026-78175
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.0.7 via the parameter of the AJAX handler. This is due to the handler lacking any capability or role check, relying solely on a
vulncheck.com