What is CVE-2026-27178?

CVE-2026-27178 is a high-severity vulnerability in Sergejey Majordomo, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-02-18.

How severe is CVE-2026-27178?

High severity. CVSS v3 base score is 7.2 out of 10.

XSS in Sergejey Majordomo

CVE-2026-27178

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 a…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (13.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Sergejey Majordomo — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

MajorDoMo Revisited: What I Missed in 2023 (third-party-advisory)
Fix PR: sergejey/majordomo#1177 (patch)
VulnCheck Advisory: MajorDoMo Stored Cross-Site Scripting via Method Parameters to Shoutbox (third-party-advisory)

Frequently asked questions

What is CVE-2026-27178?: CVE-2026-27178 is a high-severity vulnerability in Sergejey Majordomo, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-02-18.
How severe is CVE-2026-27178?: High severity. CVSS v3 base score is 7.2 out of 10.