Stored XSS via unescaped commentIcon attribute
Published Jul 8, 2026 · Updated Jul 8, 2026
Stored XSS in POSIMYTH Innovations Nexter Blocks 4.7.4 and earlier allows remote authenticated users to inject scripts through commentIcon. The Post Meta block renders the commentIcon block attribute without sufficient input sanitization or output escaping, preserving attacker-controlled markup in a page. Contributor-level access is required to save the payload; the script executes in the browser of any user who opens the affected page, enabling actions in that user’s WordPress session.
Summary
What happened
Stored XSS in POSIMYTH Innovations Nexter Blocks 4.7.4 and earlier allows remote authenticated users to inject scripts through commentIcon. The Post Meta block renders the commentIcon block attribute without sufficient input sanitization or output escaping, preserving attacker-controlled markup in a page. Contributor-level access is required to save the payload; the script executes in the browser of any user who opens the affected page, enabling actions in that user’s WordPress session.
The record
- CVE
- CVE-2026-6740
- Published
- Jul 8, 2026
- Updated
- Jul 8, 2026
- Vendor
- POSIMYTH Innovations
- Product
- Nexter Blocks
- Classifications
- CWE-79, CAPEC-592, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 8, 2026CVE publishedPublication date reported by the CVE source.
- Jul 8, 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 <=4.7.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
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Technologies
Your stack
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Your stack
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