Auth bypass in Umami
CVE-2026-121582
A vulnerability has been found in Umami up to 3.4.1. Impacted is an unknown function of the file src/app/api/record/route.ts of the component Record API Endpoint. Such manipulation of the argument Website leads to authorization bypass. The attack may be launched 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Umami — versions 3.4.0, 3.4.1
Weakness classification (CWE)
References
- github.com/umami-software/umami/security/advisories/GHSA-4cww-5p37-v8r2 (broken-link)
- github.com/waterhunter2000-svg/vulnerability-reports (related)
- github.com/waterhunter2000-svg/vulnerability-reports/blob/main/02-umami-record-… (exploit)
- vuldb.com/cve/CVE-2026-121582 (third-party-advisory)
- vuldb.com/submit/1019998 (third-party-advisory)
- vuldb.com/vuln/430425 (technical-description, vdb-entry)
- vuldb.com/vuln/430425/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-121582?
- CVE-2026-121582 is a medium-severity vulnerability in Umami, classified under Improper Authorization. CVSS score: 6.5/10. Published 2026-11-03.
- How severe is CVE-2026-121582?
- Medium severity. CVSS v3 base score is 6.5 out of 10.