CVE-2026-27832

High

Published: 27 February 2026

Published

27 February 2026

Modified

04 March 2026

KEV Added

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Patch

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CVSS Score 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0004 13.1th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27832 is a high-severity SQL Injection (CWE-89) vulnerability in Intermesh Group-Office. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 13.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly requires validation of the `advancedQueryData.comparator` input to prevent SQL injection exploitation.

SI-2 Flaw Remediation good match

prevent

Ensures timely flaw remediation by updating Group-Office to patched versions 26.0.8, 25.0.87, or 6.8.153.

SI-9 Information Input Restrictions good match

prevent

Enforces strict allowlist restrictions on the `comparator` field to block unauthorized SQL operators and conditions.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1213.006 Databases Collection

Adversaries may leverage databases to mine valuable information.

attack.mitre.org →

Why these techniques?

SQL injection in authenticated web endpoint of Group-Office enables remote exploitation of the public-facing application (T1190) and direct blind boolean exfiltration of password hashes from the application database (T1213.006).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.8, 25.0.87, and 6.8.153 have a SQL Injection (SQLi) vulnerability, exploitable through the `advancedQueryData` parameter (`comparator` field) on an authenticated endpoint. The endpoint `index.php?r=email/template/emailSelection` processes `advancedQueryData` and…

forwards the SQL comparator without a strict allowlist into SQL condition building. This enables blind boolean-based exfiltration of the `core_auth_password` table. Versions 26.0.8, 25.0.87, and 6.8.153 fix the issue.

Deeper analysisAI

CVE-2026-27832 is a SQL injection vulnerability (CWE-89) affecting Group-Office, an enterprise customer relationship management and groupware tool. Versions prior to 26.0.8, 25.0.87, and 6.8.153 are vulnerable through the `advancedQueryData` parameter, specifically the `comparator` field, on the authenticated endpoint `index.php?r=email/template/emailSelection`. This endpoint processes the parameter and forwards the SQL comparator without a strict allowlist into SQL condition building, with a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

An authenticated attacker with low privileges can exploit this vulnerability remotely over the network with low complexity and no user interaction required. Successful exploitation enables blind boolean-based exfiltration of sensitive data from the `core_auth_password` table, potentially leading to high impacts on confidentiality, integrity, and availability, such as unauthorized access to password hashes or further system compromise.

The GitHub Security Advisory (GHSA-vfgv-8w8v-qpxr) confirms that updating to Group-Office versions 26.0.8, 25.0.87, or 6.8.153 resolves the issue by addressing the lack of input validation on the `comparator` field.