CVE-2026-25554Network attack vector

Authentication bypass via unescaped JWT tag claim

Published Feb 25, 2026 · Updated Feb 25, 2026

SQL injection in OpenSIPS 3.1 through 3.6.3 allows remote attackers to bypass JWT authentication and impersonate identities. jwt_db_authorize() decodes an unverified JWT tag claim and interpolates it unescaped into a raw query whose returned secret is then trusted for signature verification. Exploitation requires auth_jwt with db_mode enabled and a SQL backend; a crafted token can inject a known signing secret and authenticate as an arbitrary mapped identity.

CVSS severity8.3
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

SQL injection in OpenSIPS 3.1 through 3.6.3 allows remote attackers to bypass JWT authentication and impersonate identities. jwt_db_authorize() decodes an unverified JWT tag claim and interpolates it unescaped into a raw query whose returned secret is then trusted for signature verification. Exploitation requires auth_jwt with db_mode enabled and a SQL backend; a crafted token can inject a known signing secret and authenticate as an arbitrary mapped identity.

The record

CVE
CVE-2026-25554
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
OpenSIPS
Product
OpenSIPS
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1 <3.6.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSIPS · OpenSIPSversion=3.1 <3.6.4

Published CVSS scores

8.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo