CVE-2023-6629

POST SMTP Mailer <= 2.8.6 - Reflected Cross-Site Scripting via msg

MEDIUM
6.1
CVSS Score
Published: January 3, 2024 at 04:29 AM UTC
Updated: June 17, 2026 at 06:51 AM UTC
2 products affected across 2 vendorsPost SMTPPost SMTP

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘msg’ parameter in all versions up to, and including, 2.8.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Post SMTP· Wpexpertswordpress-plugin
95%
v < 2.8.7
Affected range stops below 2.8.7, so it looks safe — our inference, not a vendor statement
Post SMTP· Saadiqbalwordpress-plugin
60%
v ≤ 2.8.6

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMWordfence
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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