PT-2021-22527 · WordPress · H5P Css Editor

P7E4 · Published 2021-12-14 · Updated 2021-12-16 · CVE-2021-39318

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions: H5P CSS Editor WordPress plugin versions up to and including 1.0

Description: The issue allows attackers to inject arbitrary web scripts via the h5p-css-file parameter in the ~/h5p-css-editor.php file, enabling Reflected Cross-Site Scripting attacks.

Recommendations: For versions up to and including 1.0, update to a version that contains a fix for this issue to prevent Reflected Cross-Site Scripting attacks. As a temporary workaround, consider restricting access to the ~/h5p-css-editor.php file to minimize the risk of exploitation. Avoid using the h5p-css-file parameter in the affected endpoint until the issue is resolved.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-39318

Affected Products

H5P Css Editor

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2021-39318 · Security Note
• https://osv.dev/vulnerability/CVE-2021-39318 · Vendor Advisory
• https://plugins.trac.wordpress.org/browser/h5p-css-editor/tags/1.0/h5p-css-editor.php#L50 · Note
• https://wordfence.com/vulnerability-advisories/#CVE-2021-39318 · Note