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    CVE-2023-5770

    Proofpoint Enterprise Protection contains a vulnerability in the email delivery agent that allows an unauthenticated attacker to inject improperly encoded HTML into the email body of a message through the email subject. The vulnerability is caused by inappropriate encoding when rewriting the email before delivery.This issue affects Proofpoint Enterprise Protection: from 8.20.2 before patch 4809, from 8.20.0 before patch 4805, from 8.18.6 before patch 4804 and all other prior versions.

    Published:Jan 9, 2024
    Last Modified:Jun 3, 2025
    EPS:Jan 9, 2024
    EPSS Score:0.00217
    CVSS Score:5.3

    Affected Products

    Vendor
    Proofpoint
    Product
    Enterprise Protection

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-468 Generic Cross-Browser Cross-Domain Theft

    Related CVEs

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    CVE-2025-0431 (CVSS 5.8) — Enterprise Protection contains a vulnerability in URL rewriting that allows an unauthenticated remote attacker…
    CVE-2024-3676 (CVSS 7.5) — The Proofpoint Encryption endpoint of Proofpoint Enterprise Protection contains an Improper Input Validation v…
    CVE-2024-0862 (CVSS 5) — The Proofpoint Encryption endpoint of Proofpoint Enterprise Protection contains a Server-Side Request Forgery …
    CVE-2023-5771 (CVSS 6.1) — Proofpoint Enterprise Protection contains a stored XSS vulnerability in the AdminUI. An unauthenticated attack…
    CVE-2023-0090 (CVSS 9.8) — The webservices in Proofpoint Enterprise Protection (PPS/POD) contain a vulnerability that allows for an anony…
    CVE-2023-0089 (CVSS 8.8) — The webutils in Proofpoint Enterprise Protection (PPS/POD) contain a vulnerability that allows an authenticat…
    CVE-2022-46334 (CVSS 7.8) — Proofpoint Enterprise Protection (PPS/PoD) contains a vulnerability which allows the pps user to escalate to r…
    CVE-2022-46333 (CVSS 7.2) — The admin user interface in Proofpoint Enterprise Protection (PPS/PoD) contains a command injection vulnerabil…
    CVE-2022-46332 (CVSS 9.6) — The Admin Smart Search feature in Proofpoint Enterprise Protection (PPS/PoD) contains a stored cross-site scri…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High