CVE-2026-39355: CWE-862: Missing Authorization in MGeurts genealogy
Genealogy is a family tree PHP application. Prior to 5.9.1, a critical broken access control vulnerability in the genealogy application allows any authenticated user to transfer ownership of arbitrary non-personal teams to themselves. This enables complete takeover of other users’ team workspaces and unrestricted access to all genealogy data associated with the compromised team. This vulnerability is fixed in 5.9.1.
AI Analysis
Technical Summary
CVE-2026-39355 is a critical missing authorization vulnerability in the MGeurts genealogy PHP application before version 5.9.1. Authenticated users can exploit this broken access control issue to transfer ownership of non-personal teams to themselves, thereby gaining complete control over those teams and access to all related data. This vulnerability compromises confidentiality, integrity, and availability of the affected application data. The vulnerability is fixed in version 5.9.1.
Potential Impact
Successful exploitation allows an authenticated attacker to fully take over other users' team workspaces, gaining unrestricted access to all genealogy data associated with those teams. This leads to complete compromise of confidentiality, integrity, and availability of the affected data and team resources.
Mitigation Recommendations
Upgrade MGeurts genealogy to version 5.9.1 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 5.9.1, applying this official update is the recommended remediation. No other mitigation guidance is provided or necessary.
CVE-2026-39355: CWE-862: Missing Authorization in MGeurts genealogy
Description
Genealogy is a family tree PHP application. Prior to 5.9.1, a critical broken access control vulnerability in the genealogy application allows any authenticated user to transfer ownership of arbitrary non-personal teams to themselves. This enables complete takeover of other users’ team workspaces and unrestricted access to all genealogy data associated with the compromised team. This vulnerability is fixed in 5.9.1.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39355 is a critical missing authorization vulnerability in the MGeurts genealogy PHP application before version 5.9.1. Authenticated users can exploit this broken access control issue to transfer ownership of non-personal teams to themselves, thereby gaining complete control over those teams and access to all related data. This vulnerability compromises confidentiality, integrity, and availability of the affected application data. The vulnerability is fixed in version 5.9.1.
Potential Impact
Successful exploitation allows an authenticated attacker to fully take over other users' team workspaces, gaining unrestricted access to all genealogy data associated with those teams. This leads to complete compromise of confidentiality, integrity, and availability of the affected data and team resources.
Mitigation Recommendations
Upgrade MGeurts genealogy to version 5.9.1 or later, where this vulnerability is fixed. Since the vendor advisory confirms the fix in 5.9.1, applying this official update is the recommended remediation. No other mitigation guidance is provided or necessary.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-06T21:29:17.349Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d5874b43e2781bad84eb12
Added to database: 4/7/2026, 10:38:03 PM
Last enriched: 4/7/2026, 10:38:56 PM
Last updated: 4/8/2026, 3:36:30 AM
Views: 8
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.