CVE-2026-84223: CWE-79 Cross-Site Scripting (XSS) in Kirki
The Kirki WordPress plugin before 6.3.1 does not sanitize uploaded SVG files while making them uploadable site-wide, allowing users with author-level access and above to upload a file containing JavaScript which is then served from the site's own origin and runs in the session of anyone who opens it.
AI Analysis
Technical Summary
CVE-2026-84223 is a cross-site scripting (CWE-79) vulnerability in the Kirki WordPress plugin before version 6.3.1. The flaw arises from insufficient sanitization of uploaded SVG files, enabling users with author-level privileges or greater to upload SVG files containing embedded JavaScript. When these files are accessed, the JavaScript executes in the session context of site visitors, potentially leading to session hijacking or other script-based attacks.
Potential Impact
Users with author-level access or higher can upload malicious SVG files containing JavaScript, which is then served from the site's own origin. This allows the execution of arbitrary scripts in the context of other users' sessions, potentially leading to session hijacking, data theft, or other malicious actions within the affected site.
Mitigation Recommendations
Upgrade the Kirki plugin to version 6.3.1 or later, where this vulnerability is fixed by proper sanitization of uploaded SVG files. Until the update is applied, restrict author-level and higher users from uploading SVG files or disable SVG uploads site-wide if possible.
CVE-2026-84223: CWE-79 Cross-Site Scripting (XSS) in Kirki
Description
The Kirki WordPress plugin before 6.3.1 does not sanitize uploaded SVG files while making them uploadable site-wide, allowing users with author-level access and above to upload a file containing JavaScript which is then served from the site's own origin and runs in the session of anyone who opens it.
CVSS v3.1
Score 6.8medium
Affected software
Kirki
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-84223 is a cross-site scripting (CWE-79) vulnerability in the Kirki WordPress plugin before version 6.3.1. The flaw arises from insufficient sanitization of uploaded SVG files, enabling users with author-level privileges or greater to upload SVG files containing embedded JavaScript. When these files are accessed, the JavaScript executes in the session context of site visitors, potentially leading to session hijacking or other script-based attacks.
Potential Impact
Users with author-level access or higher can upload malicious SVG files containing JavaScript, which is then served from the site's own origin. This allows the execution of arbitrary scripts in the context of other users' sessions, potentially leading to session hijacking, data theft, or other malicious actions within the affected site.
Mitigation Recommendations
Upgrade the Kirki plugin to version 6.3.1 or later, where this vulnerability is fixed by proper sanitization of uploaded SVG files. Until the update is applied, restrict author-level and higher users from uploading SVG files or disable SVG uploads site-wide if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-01T11:50:32.830Z
- State
- PUBLISHED
Threat ID: 6aaf7de855bf5e2cf5adcf99
Added to database: 09/20/2026, 06:32:08 UTC
Last enriched: 09/20/2026, 06:47:19 UTC
Last updated: 09/21/2026, 01:15:32 UTC
Views: 11
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.