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CVE-2026-39473 Pär Thernström CVE debrief

The CVE record for CVE-2026-39473 was published on 2026-04-08T09:16:22.110Z and has not been modified since then. The NVD entry is currently Deferred. This vulnerability affects the Simple History plugin for WordPress, versions up to and including 5.24.0, allowing for the insertion of sensitive information into sent data. This could potentially enable attackers to retrieve embedded sensitive data. The vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity. Users of the Simple History plugin should be aware of this vulnerability and take necessary precautions.

Vendor
Pär Thernström
Product
Simple History
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Users of the Simple History plugin for WordPress should be aware of this vulnerability, which could potentially allow attackers to retrieve embedded sensitive data. This includes site administrators, security teams, and anyone responsible for maintaining WordPress installations with the Simple History plugin. Additionally, security teams and vulnerability management teams should prioritize updating the plugin to a version that addresses this vulnerability.

Technical summary

A vulnerability in the Simple History plugin for WordPress, versions up to and including 5.24.0, allows for the insertion of sensitive information into sent data. This could potentially enable attackers to retrieve embedded sensitive data. The vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity. The Simple History plugin is used to track changes made to WordPress sites, and this vulnerability could allow attackers to access sensitive information that should not be publicly available.

Defensive priority

Medium priority should be given to updating the Simple History plugin to a version that addresses this vulnerability. This should be part of regular vulnerability management and patching processes.

Recommended defensive actions

  • Inventory and verify installed version of Simple History plugin
  • Update Simple History plugin to a version that addresses this vulnerability
  • Monitor for potential exploitation attempts
  • Review and update incident response plans
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

Evidence for this vulnerability comes from the NVD and Patchstack. Further verification is recommended. The NVD entry is currently Deferred. Additional review of the Simple History plugin and its usage within the affected WordPress environments is necessary to fully understand the exposure. Defenders should verify the plugin version and review logs for potential exploitation attempts.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-04-08T09:16:22.110Z and has not been modified since then. The NVD entry is currently Deferred.