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OpenAdvisories
High · 8.1 CVE-2026-25529 EUVD-2026-11603

Postal has HTML injection / XSS in message view

Published Mar 12, 2026 · Updated Mar 12, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
postalserver postal < 3.3.5 —

References