CVE-2026-112867 H5P CVE debrief

Who should care

Defenders responsible for WordPress installations with the H5P plugin should assess exposure and prioritize remediation. They should verify affected versions and apply updates or patches. The vulnerability allows for Stored XSS, potentially enabling attackers to inject malicious scripts into web pages.

Why it matters

Defenders should care about CVE-2026-112867 because it involves a Cross-site Scripting (XSS) vulnerability in the WordPress H5P plugin, which could allow attackers to inject malicious scripts. This vulnerability requires verification of affected versions and timely remediation to prevent potential exploitation.

• Potential injection of malicious scripts into web pages, leading to unauthorized actions or data theft.
• Possible disruption of web application functionality or user experience.
• Need for verification of current plugin versions and timely application of updates or patches.
• Requirement for enhanced monitoring and logging to detect potential exploitation attempts.

Technical summary

The WordPress H5P plugin versions up to and including 1.17.9 are vulnerable to a Stored Cross-site Scripting (XSS) attack. This vulnerability is due to improper neutralization of input during web page generation. The vulnerability allows for Stored XSS, potentially enabling attackers to inject malicious scripts into web pages. Defenders should assess exposure and prioritize remediation.

Defensive priority

Defenders should prioritize verifying and updating the H5P plugin to a version beyond 1.17.9 if currently using an affected version.

Recommended defensive actions

• Verify the current version of the H5P plugin and update to a version beyond 1.17.9 if necessary.
• Review and monitor web application logs for suspicious activity indicative of exploitation.
• Implement Content Security Policy (CSP) and other security headers to mitigate XSS attacks.

Evidence notes

The CVE Program and NVD have documented this vulnerability, providing details on its existence and potential impact. The vulnerability affects WordPress H5P plugin versions up to and including 1.17.9. Defenders should verify affected versions and apply updates or patches. The vulnerability allows for Stored XSS, potentially enabling attackers to inject malicious scripts into web pages.

Sources and 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.