Stored XSS via unsanitized rule name rendering
Published Feb 19, 2026 · Updated Feb 19, 2026
Stored XSS in GFI MailEssentials before 22.4 allows remote authenticated users to execute scripts through Mail Monitoring rules. The Save endpoint stores HTML or JavaScript from the JSON name field and later renders that value in the management interface without safe neutralization. Access to rule creation and interaction by a logged-in user are required, and the resulting script runs in that user's browser context.
Summary
What happened
Stored XSS in GFI MailEssentials before 22.4 allows remote authenticated users to execute scripts through Mail Monitoring rules. The Save endpoint stores HTML or JavaScript from the JSON name field and later renders that value in the management interface without safe neutralization. Access to rule creation and interaction by a logged-in user are required, and the resulting script runs in that user's browser context.
The record
- CVE
- CVE-2026-23608
- Published
- Feb 19, 2026
- Updated
- Feb 19, 2026
- Vendor
- GFI Software
- Product
- GFI MailEssentials
- Classifications
- CWE-79
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 19, 2026CVE publishedPublication date reported by the CVE source.
- Feb 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <22.4
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo