Summary
Sync-in Server has a complete 2FA Bypass via POST /api/auth/token
Impact
An attacker who already knows valid credentials for a 2FA-enabled account can obtain unrestricted Bearer access and refresh JWTs in a single HTTP request, without knowing the TOTP secret or possessing the authenticator device. 2FA security is bypassed for Bearer-token API authentication.
CVE-2026-58269 has a CVSS score of 8.1 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.4.0); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Gate the token endpoint behind the same 2FA policy used by the login route. After AuthLocalGuard validates the username and password, require a valid TOTP code when server-side TOTP is enabled and user.twoFaEnabled is true, before calling getTokens().
Frequently Asked Questions
- What is CVE-2026-58269? CVE-2026-58269 is a high-severity security vulnerability in @sync-in/server (npm), affecting versions <= 2.3.0. It is fixed in 2.4.0.
- How severe is CVE-2026-58269? CVE-2026-58269 has a CVSS score of 8.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of @sync-in/server are affected by CVE-2026-58269? @sync-in/server (npm) versions <= 2.3.0 is affected.
- Is there a fix for CVE-2026-58269? Yes. CVE-2026-58269 is fixed in 2.4.0. Upgrade to this version or later.
- Is CVE-2026-58269 exploitable, and should I be worried? Whether CVE-2026-58269 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-58269 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-58269? Upgrade
@sync-in/serverto 2.4.0 or later.