Read the docs
TI-2026-20638 Aliases CVE-2026-25529

Postal has HTML injection / XSS in message view

Priority LOW 35CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00267 18th percentileScored 2026-11-07
Fix Fixed postal (postalserver): 3.3.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
postalserverpostalbefore 3.3.53.3.5Patch availableCNA
  • postal Vendorpostalserver Affected before 3.3.5 Fixed in 3.3.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:postalserver:postal:*:*:*:*:*:*:*:*before 3.3.5Vulnerablepostalserver
  • cpe:2.3:a:postalserver:postal:*:*:*:*:*:*:*:* Versions before 3.3.5 Vulnerable ·postalserver

Remediation

  • Fix · CNA postal (postalserver) Fixed in 3.3.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25529

References

Advisory 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences