High severity · published Mar 27, 2026
CVE-2026-33755
Authenticated SQL Injection in Contact/query addressBookIds filter
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.158, 25.0.92, and 26.0.17, an authenticated SQL Injection vulnerability in the JMAP `Contact/query` endpoint allows any authenticated user with basic addressbook access to extract arbitrary data from the database — including active session tokens of other users. This enables full account takeover of any user, including the System Administrator, without knowing their password. Versions 6.8.158, 25.0.92, and 26.0.17 fix the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
groupoffice · Intermesh
< 6.8.158; < 25.0.92; < 26.0.17 · source: vendor
GR
Group-office · Intermesh
before 6.8.158; 25.0.1 before 25.0.92; 26.0.1 before 26.0.17 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33755
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33755
Exploit
https://github.com/Intermesh/groupoffice/security/advisories/GHSA-3gc4-5993-c2qc
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