WORDFENCE-c34ef5e3-afcd-4686-861f-5e382812233aWordfence

Vulnerability Summary

WordPress Core's theme installer (theme.js RunInstaller) passed the 'theme' slug from theme-install.php?theme=<slug> into a jQuery attribute selector ($('div[data-slug="'+slug+'"]')) without escaping, and matched any element rather than only theme cards. A crafted URL can automatically install and preview an inactive WordPress.org theme and inject an arbitrary jQuery selector.

Severity Level

MEDIUM(4.3)

Published Date

Sep 17, 2026

Last Modified

Sep 17, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

Data Pending

Root Weakness (CWE)

CWE-1021: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 4.3 (MEDIUM)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

ConfidentialityNone

IntegrityLow

AvailabilityNone

Affected & Patched Versions

Affected Versions

WordPress * - 6.6.7
WordPress 6.7 - 6.7.7
WordPress 6.8 - 6.8.8
WordPress 6.9 - 6.9.7
WordPress 7.0 - 7.0.4
WordPress 7.1 - 7.1

Patched Versions

WordPress 1

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