CVE-2026-34838
Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.03%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.156, 25.0.90, and 26.0.12, a vulnerability in the AbstractSettingsCollection model leads to insecure deserialization when these settings are loaded. By injecting a serialized FileCookieJar object into a setting string, an authenticated attacker can achieve Arbitrary File Write, leading directly to Remote Code Execution (RCE) on the server. This issue has been patched in versions 6.8.156, 25.0.90, and 26.0.12.
- CVSS 3.1
- 9.9 CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 1.03% probability · 62th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-502
- Affected
- intermesh/group-office
- Source
- security-advisories@github.com
References
- https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90Release Notes
- https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12Release Notes
- https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156Release Notes
- https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxqVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.