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PatchSiren cyber security CVE debrief

CVE-2026-89303 Post Voting System CVE debrief

The Post Voting System WordPress plugin through 1.0 does not properly sanitize and escape a parameter before using it in a SQL query, allowing any authenticated user to perform SQL injection attacks. This vulnerability can lead to potential data breaches or system compromise. Defenders responsible for WordPress installations with the Post Voting System plugin should assess exposure and prioritize verification of the plugin's presence and version. They should also review compensating controls for exposed systems while remediation is scheduled and verified. The CVE record and NVD entry provide limited information about this vulnerability, primarily focusing on the plugin's lack of

Vendor
Post Voting System
Product
Post Voting System WordPress plugin
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-28
Original CVE updated
2026-09-28
Advisory published
2026-09-28
Advisory updated
2026-09-28

Who should care

Defenders responsible for WordPress installations with the Post Voting System plugin should assess exposure and prioritize verification of the plugin's presence and version.

Why it matters

Defenders should care about CVE-2026-89303 because it allows authenticated users to perform SQL injection attacks, potentially leading to data breaches or system compromise. WordPress installations with the Post Voting System plugin should verify the plugin's presence and version, and prioritize updating to a version that addresses this vulnerability.

  • Potential SQL injection attacks by authenticated users
  • Need for verification of plugin presence and version in WordPress installations
  • Importance of monitoring and logging for potential SQL injection attacks

Technical summary

The Post Voting System WordPress plugin through 1.0 does not properly sanitize and escape a parameter before using it in a SQL query, allowing any authenticated user to perform SQL injection attacks. This vulnerability can lead to potential data breaches or system compromise. The plugin's lack of proper sanitization and escape of a parameter makes it vulnerable to SQL injection attacks. Defenders should prioritize verifying the presence of this plugin in their WordPress installations and ensure that it is updated to a version that addresses this vulnerability.

Defensive priority

Defenders should prioritize verifying the presence of this plugin in their WordPress installations and ensure that it is updated to a version that addresses this vulnerability.

Recommended defensive actions

  • Verify the presence of the Post Voting System WordPress plugin in your WordPress installations
  • Check if the plugin is updated to a version that addresses this vulnerability
  • Implement additional monitoring and logging to detect potential SQL injection attacks

Evidence notes

The CVE record and NVD entry provide limited information about this vulnerability, primarily focusing on the plugin's lack of proper sanitization and escape of a parameter, leading to SQL injection attacks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-89303 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-89303

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-89303 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-89303

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.