# CVE-2026-121531: Umami 2FA Policy route.ts single-factor authentication

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- n/a / Umami: 3.3.* (affected); 3.4.0 (affected); 3.4.1 (affected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P; source: CNA: VulDB

- CVSS 3.1: 6.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 3.0: 6.3 (medium); CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 2.0: 6.5 (medium); AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:C; source: CNA: VulDB

- CVSS 4.0: 2.1 (low); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: cna@vuldb.com

- CVSS 3.1: 6.3 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L; source: NVD: cna@vuldb.com

- CVSS 2.0: 6.5 (medium); AV:N/AC:L/Au:S/C:P/I:P/A:P; source: NVD: cna@vuldb.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-308, CWE-287

## Exploit evidence

- exploit: https://github.com/waterhunter2000-svg/vulnerability-reports/blob/main/03-umami-enforced-2fa-not-applied.md (CNA: VulDB)

## References

- https://vuldb.com/vuln/430290 (CNA: VulDB; vdb-entry)

- https://vuldb.com/vuln/430290/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-121531 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/1019994 (CNA: VulDB; third-party-advisory)

- https://github.com/waterhunter2000-svg/vulnerability-reports (CNA: VulDB; related)

- https://github.com/umami-software/umami/security/advisories/GHSA-29fx-pxjg-35rm (CNA: VulDB; broken-link)

- https://github.com/waterhunter2000-svg/vulnerability-reports/blob/main/03-umami-enforced-2fa-not-applied.md (CNA: VulDB; exploit)

- https://github.com/umami-software/umami/security/advisories/GHSA-29fx-pxjg-35rm (cna@vuldb.com)

- https://github.com/waterhunter2000-svg/vulnerability-reports (cna@vuldb.com)

- https://github.com/waterhunter2000-svg/vulnerability-reports/blob/main/03-umami-enforced-2fa-not-applied.md (cna@vuldb.com)

- https://vuldb.com/cve/CVE-2026-121531 (cna@vuldb.com)

- https://vuldb.com/submit/1019994 (cna@vuldb.com)

- https://vuldb.com/vuln/430290 (cna@vuldb.com)

- https://vuldb.com/vuln/430290/cti (cna@vuldb.com)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-121531; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121531; retrieved 2026-11-04; source updated 2026-11-03

Revision: 64e642c9aee99f028de8f4f723d4bcb0c70bd358989bfc7c43902d52989b2e0f

Canonical: https://y2.dev/cve/CVE-2026-121531

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