CVE-2026-34838

critical · 9.9

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.

9.9

CVSS

1.0%

EPSS (exploit prob.)

62nd

EPSS percentile

2026-04-02

Published

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses

CWE-502

Affected products

Vendor	Product	Affected versions
intermesh	group-office	< 6.8.156
intermesh	group-office	>= 25.0.1, < 25.0.90
intermesh	group-office	>= 26.0.1, < 26.0.12

Check a specific version with /api/v1/cve/match.

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/Intermesh/groupoffice/security/advisories/GHSA-h22j-frrf-5vxq

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-34838