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TI-2026-21620 Aliases CVE-2026-27178GHSA-5c8c-h849-76wx

MajorDoMo Stored Cross-Site Scripting via Method Parameters to Shoutbox

Priority LOW 30CWE-79Published · Updated

Key facts

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

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

Summary

MajorDoMo (aka Major Domestic Module) contains a stored cross-site scripting (XSS) vulnerability through method parameter injection into the shoutbox. The /objects/?method= endpoint allows unauthenticated execution of stored methods with attacker-controlled parameters. Default methods such as ThisComputer.VolumeLevelChanged pass the user-supplied VALUE parameter directly into the say() function, which stores the message raw in the shouts database table without escaping. The shoutbox widget renders stored messages without sanitization in both PHP rendering code and HTML templates. Because the dashboard widget auto-refreshes every 3 seconds, the injected script executes automatically when any administrator loads the dashboard, enabling session hijack through cookie exfiltration.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00265 18th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
sergejeyMajorDoMoall versions—No fix listedCNA
  • MajorDoMo Vendorsergejey Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mjdm:majordomo:-:*:*:*:*:*:*:*not specified by NVDVulnerablesergejey
  • cpe:2.3:a:mjdm:majordomo:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·sergejey

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27178
  2. 2026-10-03 Alias added: GHSA-5c8c-h849-76wx

References

Exploit 2

  • TI-2026-21617 MajorDoMo Command Injection in rc/index.php via Race Condition CVSS 4.0CRITICAL 9.2
  • TI-2026-21616 MajorDoMo Unauthenticated Remote Code Execution via Admin Console Eval CVSS 4.0CRITICAL 9.3
  • TI-2026-21623 MajorDoMo Unauthenticated Module Uninstall via Market Endpoint CVSS 4.0HIGH 8.7
  • TI-2023-27813 MajorDoMo (aka Major Domestic Module) before 0662e5e allows command execution via… CVSS 3.1CRITICAL 9.8
  • TI-2026-21622 MajorDoMo Supply Chain Remote Code Execution via Update URL Poisoning CVSS 4.0CRITICAL 9.3
  • TI-2026-21621 MajorDoMo Unauthenticated SQL Injection in Commands Module CVSS 4.0HIGH 8.8
See all 8 →

Sources

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