CVE-2026-121531 Details
Description
A vulnerability has been found in Umami 3.3.x/3.4.0/3.4.1. This affects an unknown part of the file src/app/api/auth/login/route.ts of the component 2FA Policy Handler. The manipulation leads to use of single-factor authentication. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
A vulnerability in Umami versions 3.3.x, 3.4.0, and 3.4.1 allows for bypassing enforced two-factor authentication (2FA) policies during the login process. The issue arises in the 2FA Policy Handler component, specifically within the file 'src/app/api/auth/login/route.ts'. This vulnerability enables accounts marked as requiring 2FA to log in using only a password, effectively undermining the authentication security. The vulnerability can be exploited remotely, and has been publicly disclosed.
The vulnerability can be addressed by updating the login handler to recognize and enforce all levels of 2FA requirements. Implementing a centralized function to check 2FA requirements for users can also help maintain consistency across different API endpoints.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 3, 2026CISA-ADP
Assessed Nov 3, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/umami-software/umami/security/advisories/GHSA-29fx-pxjg-35rm | [email protected] | AdvisoryBroken LinkVendor |
| https://github.com/waterhunter2000-svg/vulnerability-reports | [email protected] | BundleTechnical Description |
| https://github.com/waterhunter2000-svg/vulnerability-reports/blob/main/03-umami-enforced-2fa-not-applied.md | [email protected] | ExploitTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-121531 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1019994 | [email protected] | Permission Required |
| https://vuldb.com/vuln/430290 | [email protected] | Permission Required |
| https://vuldb.com/vuln/430290/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
| CWE-308 | Use of Single-factor Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Umami | 3.4.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 3, 2026 | CVE Modified | CISA-ADP |
| Nov 3, 2026 | New CVE Received | [email protected] |