Browser script execution via evaluated JSON input
Published Feb 9, 2024 · Updated May 15, 2025
DOM-based XSS in Zalify EasyEmail 4.12.2 and earlier allows local users to execute JavaScript through JSON source input. The SourceCodePanel onBlur handler passes event.target.value to eval before JSON serialization, without sanitizing the text. Exploitation requires editing a template JSON source and shifting focus, which executes the supplied script in the browser context.
Summary
What happened
DOM-based XSS in Zalify EasyEmail 4.12.2 and earlier allows local users to execute JavaScript through JSON source input. The SourceCodePanel onBlur handler passes event.target.value to eval before JSON serialization, without sanitizing the text. Exploitation requires editing a template JSON source and shifting focus, which executes the supplied script in the browser context.
The record
- CVE
- CVE-2023-39683
- Published
- Feb 9, 2024
- Updated
- May 15, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 9, 2024CVE publishedPublication date reported by the CVE source.
- May 15, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- JSON Source Code Panel alert proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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