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Q1What is this vulnerability? (Essence + Consequences)
🚨 **Essence**: Group Office suffers from **Unsafe Deserialization** in the `AbstractSettingsCollection` model.…
📦 **Affected Versions**:
- Group Office **6.8.156** and earlier
- Group Office **25.0.90** and earlier
- Group Office **26.0.12** and earlier
🏢 **Vendor**: Intermesh (Group Office).
Q4What can hackers do? (Privileges/Data)
💀 **Attacker Capabilities**:
- **Remote Code Execution (RCE)**: Run arbitrary commands on the server.
- **Arbitrary File Write**: Modify or create files on the filesystem.
- **Full System Compromise**: High impact on Co…
🔐 **Exploitation Threshold**: **Medium**. The CVSS vector `PR:L` indicates **Privileges Required**. An attacker likely needs **authenticated access** to the Group Office application to trigger the deserialization flaw.…
🕵️ **Public Exploit Status**: **No**. The `pocs` field is empty. While GitHub advisories exist, there are no confirmed public Proof-of-Concept (PoC) exploits or widespread wild exploitation reported yet.
Q7How to self-check? (Features/Scanning)
🔍 **Self-Check Method**:
1. Check your Group Office version against the affected list.
2. Scan for the `AbstractSettingsCollection` class usage in custom modules.
3.…
✅ **Official Fix**: **Yes**. Patches are available in the following releases:
- v6.8.156
- v25.0.90
- v26.0.12
🔗 **Reference**: [GitHub Advisory GHSA-h22j-frrf-5vxq](https://github.com/Intermesh/groupoffice/security/advi…