CVE-2026-39178: SOGo SQL Injection Vulnerability

CVE-2026-39178 Overview

CVE-2026-39178 is a SQL injection vulnerability in SOGo, an open-source groupware server used for collaborative mail, calendar, and contact management. The flaw affects SOGo versions prior to 5.12.7. Authenticated users can execute arbitrary SQL statements by injecting payloads into the search parameter of the allContactSearch endpoint. The maintainer, Alinto, addressed the issue in SOGo 5.12.7 through commit 1f7e5d2b2c2047c44a6a9e05f73c36491cb96d21.

Critical Impact
Authenticated attackers can read, modify, or exfiltrate arbitrary database contents through the allContactSearch endpoint, exposing user credentials, contacts, and mail metadata stored by SOGo.

Affected Products

SOGo groupware server versions prior to 5.12.7
Deployments exposing the allContactSearch endpoint to authenticated users
Downstream distributions packaging vulnerable SOGo builds

Discovery Timeline

2026-07-08 - CVE-2026-39178 published to NVD
2026-07-08 - Last updated in NVD database

Technical Details for CVE-2026-39178

Vulnerability Analysis

SOGo exposes an allContactSearch endpoint that queries the contact store based on a user-supplied search parameter. In versions prior to 5.12.7, the endpoint concatenates the search value into a SQL query without sufficient parameterization or escaping. Authenticated users can therefore inject SQL syntax that alters the intended query structure.

Because SOGo stores authentication tokens, user profile data, mail folder metadata, and contact records in its backend database, a successful injection returns data well beyond what the search feature is meant to expose. Depending on the database engine and account privileges, an attacker may also modify records or invoke database-native functions.

Root Cause

The root cause is improper neutralization of special elements used in a SQL command [CWE-89]. The allContactSearch handler builds the SQL statement by embedding the untrusted search string directly into the query text rather than binding it as a parameter. The fix in commit 1f7e5d2b2c2047c44a6a9e05f73c36491cb96d21 corrects the query construction path so that the search value is treated strictly as data.

Attack Vector

Exploitation requires an authenticated session against the SOGo web interface. The attacker sends a crafted HTTP request to the allContactSearch endpoint with a malicious search parameter containing SQL metacharacters and injected clauses. The server appends the payload to its query, executes the tampered statement, and returns results or error output that the attacker uses to enumerate the database.

No verified public exploit code is currently referenced for this issue. Review the upstream patch and release notes for further technical detail.

Detection Methods for CVE-2026-39178

Indicators of Compromise

HTTP requests to allContactSearch containing SQL metacharacters such as single quotes, UNION, SELECT, --, or ; in the search parameter
Database error responses returned to clients when querying contacts
Unusually large or malformed search values in SOGo access logs
Unexpected outbound database queries or long-running statements originating from the SOGo application user

Detection Strategies

Inspect SOGo web server access logs and application logs for allContactSearch requests with suspicious search payloads.
Enable and review database query logs for SELECT statements referencing tables outside the contacts schema initiated by the SOGo service account.
Alert on repeated authentication events followed by high-volume access to allContactSearch from a single principal.

Monitoring Recommendations

Deploy a web application firewall rule that flags SQL injection patterns targeting the /SOGo/so/*/Contacts/*/allContactSearch URL space.
Baseline normal search parameter length and character sets, then alert on deviations.
Forward SOGo, reverse proxy, and database logs to a centralized analytics platform for cross-source correlation.

How to Mitigate CVE-2026-39178

Immediate Actions Required

Upgrade SOGo to version 5.12.7 or later on all nodes in the cluster.
Rotate database and administrative credentials that may have been exposed through the vulnerable endpoint.
Audit application and database logs for evidence of prior exploitation attempts against allContactSearch.
Restrict SOGo web interface exposure to trusted networks or VPN clients where possible.

Patch Information

Alinto released the fix in SOGo 5.12.7. The upstream change is tracked in commit 1f7e5d2b2c2047c44a6a9e05f73c36491cb96d21 and announced in the SOGo Version Release Announcement. Package maintainers for Debian, Red Hat, and other distributions should ship rebuilt binaries based on this release.

Workarounds

Block or rate-limit requests to the allContactSearch endpoint at the reverse proxy until patching is complete.
Enforce least-privilege permissions on the database account used by SOGo so that injection cannot reach unrelated schemas.
Require multi-factor authentication for SOGo accounts to raise the barrier for the required authenticated access.

bash

# Example nginx snippet to temporarily block the vulnerable endpoint
location ~* /SOGo/so/.*/Contacts/.*/allContactSearch {
    return 403;
}