Email and Web Appliance
CVE-2021-36806: Reflected XSS in Sophos Email Appliance
A reflected XSS vulnerability allows an open redirect when the victim clicks a malicious link to an error page on Sophos Email Appliance older than version 4.5.3.4.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 4.7
EPSS0.43%Chance of exploitation in 30 days
Public exploitNot tracked
FixSee advisory
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Sophos Email Appliance 4.5 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A reflected XSS vulnerability allows an open redirect when the victim clicks a malicious link to an error page on
Sophos Email Appliance
older than version 4.5.3.4.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.