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Vulnerability record · CVE-2026-58269 · published 21 September 2026

CVE-2026-58269: Authentication bypass via alternate path vulnerability

Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, `POST /api/auth/token` authenticates with username and password only, then calls `getTokens()`, which returns full access and refresh JWTs without checking whether the account has TOTP 2FA enabled. An attacker with stolen or phished credentials can bypass 2FA in a single request. The parallel login endpoint (`POST /api/auth/login`) correctly enforces 2FA by calling `setCookies(user, res, true)`, which gates on `user.twoFaEnabled`. Version 2.4.0 patches the issue.

8.1 CVSS 3.1 High EPSS 0.22% · top 88.1% CWE-288 · Authentication bypass via alternate path Deferred
8.1CVSS 3.1 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
24 Sep 2026Last modified by NVD

Description

Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, `POST /api/auth/token` authenticates with username and password only, then calls `getTokens()`, which returns full access and refresh JWTs without checking whether the account has TOTP 2FA enabled. An attacker with stolen or phished credentials can bypass 2FA in a single request. The parallel login endpoint (`POST /api/auth/login`) correctly enforces 2FA by calling `setCookies(user, res, true)`, which gates on `user.twoFaEnabled`. Version 2.4.0 patches the issue.

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

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-58269), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.