---
title: "CVE-2026-58269: Sync-in Server - Authentication Bypass"
description: "Sync-in Server < 2.4.0 contains a 2FA bypass caused by missing 2FA enforcement in POST /api/auth/token, letting attackers with stolen credentials bypass two-factor authentication in a single request."
url: https://panop.io/threat-heartbeat/CVE-2026-58269/
---

# CVE-2026-58269 Sync-in Server - Authentication Bypass

Sync-in Server < 2.4.0 contains a 2FA bypass caused by missing 2FA enforcement in POST /api/auth/token, letting attackers with stolen credentials bypass two-factor authentication in a single request.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.22% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-58269)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

21 September 2026

Updated

15 October 2026

Weakness

[CWE-288](https://cwe.mitre.org/data/definitions/288.html)

## Vendor fix

Upgrade to version 2.4.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-58269](https://nvd.nist.gov/vuln/detail/CVE-2026-58269)
- [https://github.com/Sync-in/server/security/advisories/GHSA-92cr-jxw4-5wjg](https://github.com/Sync-in/server/security/advisories/GHSA-92cr-jxw4-5wjg)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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