CVE-2026-25529

Postal has HTML injection / XSS in message view

State: Published
Severity: 8.1 High
Published: Mar 12, 2026
Updated: Mar 12, 2026
Reserved: Feb 2, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
postalpostalserver	< 3.3.5Affected

References

https://github.com/postalserver/postal/security/advisories/GHSA-5f4r-5jpr-rfhc

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