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CVE

CVE-2026-34838

Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`
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CVE

CVE-2026-34838

Group-Office: Authenticated Remote Code Execution via PHP Insecure Deserialization in `AbstractSettingsCollection`

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/Intermesh/groupoffice/releases/tag/v25.0.90, https://github.com/Intermesh/groupoffice/releases/tag/v26.0.12, https://github.com/Intermesh/groupoffice/releases/tag/v6.8.156, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34838.json, https://github.com/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq, https://nvd.nist.gov/vuln/detail/CVE-2026-34838

Severity

9.9

CVSS Score
0
10

Basic Information

Base CVSS
9.9
EPSS Probability
0.01026%
EPSS Percentile
0.60969%
Introduced Version
3c64605e5d45b524915be331b2de97cd04858cb6
Fix Available
90b206f87cee76439d3792abe84d21de922f6a29

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