Stored XSS via permitted iframe onload handler
Published Sep 2, 2026 · Updated Sep 3, 2026
Stored XSS in SEO Writing for WordPress 1.12.5 and earlier allows remote authenticated users to inject script into posts. The plugin's KSES post-context allowlist explicitly permits the onload event handler on iframe elements, so sanitization preserves a crafted payload. Contributor-level access is sufficient, and the script runs when a higher-privileged user views or previews the affected post, exposing that user's account actions and data.
Summary
What happened
Stored XSS in SEO Writing for WordPress 1.12.5 and earlier allows remote authenticated users to inject script into posts. The plugin's KSES post-context allowlist explicitly permits the onload event handler on iframe elements, so sanitization preserves a crafted payload. Contributor-level access is sufficient, and the script runs when a higher-privileged user views or previews the affected post, exposing that user's account actions and data.
The record
- CVE
- CVE-2026-75134
- Published
- Sep 2, 2026
- Updated
- Sep 3, 2026
- Vendor
- SEO Writing
- Product
- SEO Writing
- Classifications
- CWE-79, T1189
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 2, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=1.12.5
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Contributor stored XSS reproductionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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