Improper Neutralization of Special Elements in Output Used by a Downstream Component in WordPress - #VU158602
Published: November 2, 2026
Vulnerability identifier: #VU158602
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-74
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to manipulate the markup generated by WordPress Image and Playlist blocks.
The vulnerability exists due to improper neutralization of replacement-string metacharacters in the Image and Playlist blocks when building markup from block attributes using preg_replace(). A remote user can supply block attribute values containing backreferences such as $1 to cause captured content to be substituted into the generated markup instead of preserving those values literally.
Affected software
WordPress
Remediation
Install security update from vendor's website.
WordPress - addressed in versions 6.4.14, 6.5.14, 6.6.11, 6.7.11, 6.8.12, 6.9.11, 7.0.8, 7.1.4