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Vulnerabilities

Vulnerability · CVE-2026-78175

Themeum tutor_lms Deserialization of Untrusted Data

Published Oct 13, 2026 · catalog updated Oct 13, 2026 · Themeum

Patch now

CVE-2026-78175 is in the CISA known-exploited catalog. Confirm Themeum against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.07%
Remediation
Remediation guidance
Affected products
stated tutor_lms · vendor Themeum tutor_lms

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated tutor_lms<= 4.0.7
  • vendor Themeum tutor_lmsversion unspecified

How to fix CVE-2026-78175

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-78175 is in the CISA known-exploited catalog. Confirm Themeum against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with <= 4.0.7. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 1.07%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

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.

  1. 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

  2. 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.

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

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.