CVE-2026-56006
HighCVSS 7.1Summary
Versions of H5P up to 1.17.6 are vulnerable to unauthenticated Cross Site Scripting (XSS). An attacker can exploit this vulnerability to inject malicious JavaScript code.
Risk Assessment
Organizations may be exposed to user data theft and other attacks that could lead to a loss of trust in the application.
Recommendation
It is recommended to update H5P to the latest version to mitigate this vulnerability and conduct a security audit of the application.
Other vulnerabilities in H5P
See all- CVE-2026-112867Medium
The H5P plugin up to version 1.17.9 contains a Stored XSS vulnerability due to improper neutralization of input during web page generation. User input is not properly sanitized before being stored.
- CVE-2026-112868Medium
H5P through 1.17.9 contains an Authorization Bypass Through User-Controlled Key vulnerability that allows exploiting incorrectly configured access control security levels.
- CVE-2026-57321High
The H5P plugin version 1.17.7 and earlier contains a vulnerability allowing a contributor to delete arbitrary files on the server. The flaw is due to insufficient permission validation during file deletion operations.
- CVE-2025-68505Medium
The H5P plugin (versions up to and including 1.16.1) contains a Missing Authorization vulnerability that allows exploitation of incorrectly configured access control security levels. This issue affects H5P from n/a through 1.16.1.
- CVE-2025-62951Medium
The H5P plugin (icc0rz) contains a Stored Cross-site Scripting (XSS) vulnerability due to improper neutralization of input during web page generation. This issue affects versions from n/a through <= 1.16.0.
Original NVD description (English source)
Unauthenticated Cross Site Scripting (XSS) in H5P <= 1.17.6 versions.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS