CVE-2026-25529CWE-79

Postal has HTML injection / XSS in message view

High · published March 12, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
34.9
In the wild
Unconfirmed
What it is

Postal is an open source SMTP server. Postal versions less than 3.3.5 had a HTML injection vulnerability that allowed unescaped data to be included in the admin interface. The primary way for unescaped data to be added is via the API's "send/raw" method. This could allow arbitrary HTML to be injected in to the page which may modify the page in a misleading way or allow for unauthorised javascript to be executed. Fixed in 3.3.5 and higher.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00416 · 34.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-12T16:35Z
EPSS history
Timeline
  • 12 MAR 16:35Z
    Postal has HTML injection / XSS in message view
    cvelistv5