What is CVE-2026-27177?

CVE-2026-27177 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-2026-27177?

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

XSS in Sergejey Majordomo

CVE-2026-27177

MajorDoMo (aka Major Domestic Module) contains a stored cross-site scripting (XSS) vulnerability via the /objects/?op=set endpoint, which is intentionally unauthenticated for IoT device integration. User-supplied property values are stored…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (14.8th 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 Property Set Endpoint (third-party-advisory)

Frequently asked questions

What is CVE-2026-27177?: CVE-2026-27177 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-2026-27177?: High severity. CVSS v3 base score is 7.2 out of 10.