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TI-2026-84357 Aliases CVE-2026-121551GHSA-3mcr-px3q-mcw8

Stored cross-site scripting in PostfixAdmin TOTP exceptions

Priority LOW 23CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

PostfixAdmin through 4.0.5 contains a stored cross-site scripting flaw in the TOTP exception feature, where the description field is not escaped. An authenticated mailbox user can inject script by creating a TOTP exception, and the script runs in the session of a global administrator who views totp-exceptions.php. The injected script can then issue authenticated admin requests using the page's CSRF token (CWE-79).

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

PostfixAdmin through 4.0.5 contains a stored cross-site scripting vulnerability that allows authenticated mailbox users to inject script by creating a TOTP exception with an unescaped description. When a global administrator views totp-exceptions.php, the script runs in the admin session and can issue authenticated admin requests using the page's CSRF token.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00283 20th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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
postfixadminpostfixadminup to 4.0.5—No fix listedCNA
  • postfixadmin Vendorpostfixadmin Affected up to 4.0.5 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for postfixadmin.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-121551
  2. 2026-11-03 CISA SSVC decision points changed
  3. 2026-11-03 Alias added: GHSA-3mcr-px3q-mcw8

References

Patch 3

Other 4

Sources

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