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PatchSiren cyber security CVE debrief

CVE-2026-0677 TotalSuite CVE debrief

A deserialization of untrusted data vulnerability in TotalSuite TotalContest Lite allows PHP object injection. The vulnerability exists in versions up to and including 2.9.1. An attacker with low privileges can exploit this issue over the network without user interaction, potentially leading to limited impacts on confidentiality, integrity, and availability. The CVE was published on March 20, 2026, and last modified on June 10, 2026. The vulnerability status is currently Deferred in the NVD. No known exploitation in ransomware campaigns has been documented, and this CVE is not listed in CISA's Known Exploited Vulnerabilities catalog.

Vendor
TotalSuite
Product
TotalContest Lite
CVSS
MEDIUM 6.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-20
Original CVE updated
2026-06-10
Advisory published
2026-03-20
Advisory updated
2026-06-10

Who should care

Organizations running WordPress sites with TotalContest Lite plugin versions 2.9.1 or earlier should prioritize assessment and patching. Security teams managing WordPress plugin inventories and vulnerability management programs should track this issue.

Technical summary

The TotalContest Lite WordPress plugin (versions ≤ 2.9.1) contains a deserialization vulnerability (CWE-502) that permits PHP object injection. The attack vector is network-based, requires low privileges, and needs no user interaction. Successful exploitation may result in limited confidentiality, integrity, and availability impacts. The underlying issue is the deserialization of untrusted attacker-controlled data without adequate validation or sanitization.

Defensive priority

medium

Recommended defensive actions

  • Upgrade TotalContest Lite to a version newer than 2.9.1 if available, or apply vendor-supplied patches
  • Review and restrict user privileges to minimize exposure to authenticated attack vectors
  • Implement input validation and avoid deserialization of untrusted data in application code
  • Monitor WordPress plugin security advisories from Patchstack and other trusted sources for updates on this vulnerability
  • If patching is not immediately possible, consider disabling or removing the affected plugin until a fix is available

Evidence notes

CVSS 3.1 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L. CWE-502 (Deserialization of Untrusted Data) identified as the weakness. NVD vulnerability status: Deferred. No CPE criteria were available in the source record.

Official resources

The vulnerability was disclosed through Patchstack and indexed in the NVD. The affected product is TotalContest Lite, a WordPress plugin by TotalSuite. The vendor identification carries low confidence and requires review, with Patchstack as