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Kirki CVE-2026-66629

| EUVDEUVD-2026-60917 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-08-18 Patchstack GHSA-w6qp-w28w-8m5h
7.1
CVSS 3.1 · Vendor: Patchstack
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Severity by source

Vendor (Patchstack) PRIMARY
7.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
vuln.today AI
6.1 MEDIUM

Network-delivered reflected/stored XSS requiring victim click; PR:N confirmed; A:N chosen as XSS has no credible server availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

2
Analysis Generated
Aug 18, 2026 - 15:16 vuln.today
CVE Published
Aug 18, 2026 - 13:59 cve.org
HIGH 7.1

DescriptionCVE.org

Unauthenticated Cross Site Scripting (XSS) in Kirki <= 6.2.3 versions.

AnalysisAI

Unauthenticated cross-site scripting (XSS) in the Kirki WordPress customizer plugin (all versions up to and including 6.2.3) allows remote, unauthenticated attackers to inject and execute arbitrary JavaScript in a victim's browser when the victim is socially engineered into visiting a crafted URL or page. The CVSS scope change (S:C) indicates injected script execution escapes the plugin's own context, enabling session hijacking, credential theft, or unauthorized admin actions against authenticated WordPress users. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Identify target WordPress site running Kirki ≤6.2.3
Delivery
Craft malicious URL with XSS payload
Exploit
Deliver link to authenticated WordPress admin via phishing
Install
Victim clicks crafted URL
C2
Injected JavaScript executes in admin browser
Execute
Exfiltrate session token to attacker-controlled server
Impact
Gain full WordPress admin access

Vulnerability AssessmentAI

Exploitation No authentication is required to craft or deliver the exploit (PR:N per CVSS vector). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 7.1 score reflects a meaningful but not critical rating: network-accessible (AV:N), low-complexity (AC:L), no authentication required (PR:N), but dependent on user interaction (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker identifies a WordPress site running Kirki 6.2.3 or earlier, then crafts a malicious URL containing an XSS payload targeting the vulnerable Kirki input parameter. The attacker sends this URL to a logged-in WordPress administrator via email or another channel; when the administrator opens the link, the injected JavaScript executes in their browser, exfiltrates their session cookie or WordPress nonce to an attacker-controlled server, and grants the attacker full admin-level access to the WordPress site. …
Remediation The primary remediation is to update the Kirki plugin beyond version 6.2.3 immediately; consult the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/kirki/vulnerability/wordpress-kirki-plugin-6-2-3-cross-site-scripting-xss-vulnerability for the confirmed patched release version, which was not explicitly stated in the available intelligence data. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: immediately disable the Kirki customizer plugin version 6.2.3 and earlier, or if functionality is required, restrict administrative customizer access via Web Application Firewall rules blocking the vulnerable endpoints. …

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CVE-2026-66629 vulnerability details – vuln.today

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