CVE-2026-25529 HIGH

CVE-2026-25529: Postal has HTML injection / XSS in message view

Vendor Postalserver
Product postal
Weakness CWE-79 · XSS
Published March 12, 2026
Last update March 12, 2026
View on NVD All CVEs

CVSS base score

8.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 12, 2026 CVE published
March 12, 2026 Record updated