Unauthenticated session hijacking via unescaped property values
Published Feb 18, 2026 · Updated Feb 18, 2026
Stored XSS in SJLab MajorDoMo allows remote attackers to steal an administrator's session through unauthenticated property writes. The /objects/?op=set handler stores v parameters raw, and the property editor injects SOURCE and VALUE into HTML without escaping. Exploitation requires an administrator to open the poisoned property editor; the script runs on page load and can read the non-HttpOnly session cookie.
Summary
What happened
Stored XSS in SJLab MajorDoMo allows remote attackers to steal an administrator's session through unauthenticated property writes. The /objects/?op=set handler stores v parameters raw, and the property editor injects SOURCE and VALUE into HTML without escaping. Exploitation requires an administrator to open the poisoned property editor; the script runs on page load and can read the non-HttpOnly session cookie.
The record
- CVE
- CVE-2026-27177
- Published
- Feb 18, 2026
- Updated
- Feb 18, 2026
- Vendor
- MajorDoMo
- Product
- MajorDoMo
- Classifications
- CWE-79, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 18, 2026CVE publishedPublication date reported by the CVE source.
- Feb 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=*
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- MajorDoMo stored property XSS request sequenceproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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