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Vulnerability record · CVE-2025-56449 · published 29 September 2025

CVE-2025-56449: Authentication bypass by spoofing vulnerability

A security vulnerability was identified in Obsidian Scheduler's REST API 5.0.0 thru 6.3.0. If an account is locked out due to not enrolling in MFA (e.g. after the 7-day enforcement window), the REST API still allows the use of Basic Authentication to authenticate and perform administrative actions. In particular, the default admin account was found to be locked out via the web interface but still usable through the REST API. This allowed creation of a new privileged user, bypassing MFA protections. This undermines the intended security posture of MFA enforcement.

8.2 CVSS 3.1 High EPSS 0.38% · top 71.0% CWE-290 · Authentication bypass by spoofing Deferred
8.2CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

A security vulnerability was identified in Obsidian Scheduler's REST API 5.0.0 thru 6.3.0. If an account is locked out due to not enrolling in MFA (e.g. after the 7-day enforcement window), the REST API still allows the use of Basic Authentication to authenticate and perform administrative actions. In particular, the default admin account was found to be locked out via the web interface but still usable through the REST API. This allowed creation of a new privileged user, bypassing MFA protections. This undermines the intended security posture of MFA enforcement.

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

References

LinkTags
https://blog.gregscharf.com/2025/07/11/upcoming-vulnerability-advisory/
https://blog.gregscharf.com/2025/07/31/obsidian-scheduler-access-control-vulnerability/
https://wiki.obsidianscheduler.com/docs/Release_Notes#Obsidian_6.3.1

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Source: NIST National Vulnerability Database (record CVE-2025-56449), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.