Unauthenticated script execution in visitors’ browsers
Published Sep 3, 2026 · Updated Sep 3, 2026
Reflected XSS in Plugin999 Calculation For Contact Form 7 1.0 and earlier allows remote attackers to execute script in a visitor’s browser. The CNA and its sole reference identify reflected XSS but disclose no affected parameter, function, or output path that fails to neutralize input. Exploitation requires no account but does require a visitor to interact with attacker-controlled content, allowing script to run in that visitor’s site context.
Summary
What happened
Reflected XSS in Plugin999 Calculation For Contact Form 7 1.0 and earlier allows remote attackers to execute script in a visitor’s browser. The CNA and its sole reference identify reflected XSS but disclose no affected parameter, function, or output path that fails to neutralize input. Exploitation requires no account but does require a visitor to interact with attacker-controlled content, allowing script to run in that visitor’s site context.
The record
- CVE
- CVE-2026-81300
- Published
- Sep 3, 2026
- Updated
- Sep 3, 2026
- Vendor
- Plugin999
- Product
- Calculation For Contact Form 7
- Classifications
- CWE-79, CAPEC-591, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 3, 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=n/a <=1.0 changes=[{"at":"1.1","status":"unaffected"}]
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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