CVE-2026-25529

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.

PUBLISHED Reserved 2026-02-02 | Published 2026-03-12 | Updated 2026-03-12 | Assigner GitHub_M

Problem types

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

Product status

References

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

cve.org (CVE-2026-25529)

nvd.nist.gov (CVE-2026-25529)

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