OpenSIPS up to 3.6.3 JWT authorize.c jwt_db_authorize sql injection

Summaryinfo

A vulnerability marked as critical has been reported in OpenSIPS up to 3.6.3. The impacted element is the function jwt_db_authorize of the file modules/auth_jwt/authorize.c of the component JWT Handler. This manipulation causes sql injection. This vulnerability is tracked as CVE-2026-25554. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in OpenSIPS up to 3.6.3 and classified as critical. Affected by this vulnerability is the function jwt_db_authorize of the file modules/auth_jwt/authorize.c of the component JWT Handler. The manipulation with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

OpenSIPS versions 3.1 before 3.6.4 containing the auth_jwt module (prior to commit 3822d33) contain a SQL injection vulnerability in the jwt_db_authorize() function in modules/auth_jwt/authorize.c when db_mode is enabled and a SQL database backend is used. The function extracts the tag claim from a JWT without prior signature verification and incorporates the unescaped value directly into a SQL query. An attacker can supply a crafted JWT with a malicious tag claim to manipulate the query result and bypass JWT authentication, allowing impersonation of arbitrary identities.

It is possible to read the advisory at opensips.org. This vulnerability is known as CVE-2026-25554 since 02/02/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1505 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 301186 (Fedora 42 : opensips (2026-1a199d8524)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.6.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (301186) and EUVD (EUVD-2026-8694). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• OpenSIPS

Version

• 3.6.0
• 3.6.1
• 3.6.2
• 3.6.3

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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