Email Protection
CVE-2023-5771: HTML injection in AdminUI through email subject
Proofpoint Enterprise Protection contains a stored XSS vulnerability in the AdminUI.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 6.1
EPSS0.34%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
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 |
|---|---|
| Proofpoint Enterprise Protection 8.20 | patch 4796 or later |
| Proofpoint Enterprise Protection 8.18 | patch 4795 or later |
| Proofpoint Enterprise Protection 8.0 | 8.18.6 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
Proofpoint Enterprise Protection contains a stored XSS vulnerability in the AdminUI. An unauthenticated attacker can send a specially crafted email with HTML in the subject which triggers XSS when viewing quarantined messages. This issue affects Proofpoint Enterprise Protection: from 8.20.0 before patch 4796, from 8.18.6 before patch 4795 and all other prior versions.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.