CVE-2026-121582 Details
Description
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.
An authorization bypass vulnerability has been identified in Umami versions through 3.4.1, specifically within the Record API Endpoint. The issue arises in the file 'src/app/api/record/route.ts', where the application fails to properly validate the 'website' argument in the request. This oversight allows for unauthorized manipulation of session-replay data and heatmap events, enabling an attacker to inject false information into another user's analytics. The vulnerability can be exploited remotely, without the need for user credentials.
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, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/umami-software/umami/security/advisories/GHSA-4cww-5p37-v8r2 | [email protected] | AdvisoryBroken LinkVendor |
| https://github.com/waterhunter2000-svg/vulnerability-reports | [email protected] | BundleTechnical Description |
| https://github.com/waterhunter2000-svg/vulnerability-reports/blob/main/02-umami-record-unauth-write.md | [email protected] | ExploitTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-121582 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/1019998 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/430425 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/430425/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-285 | Improper Authorization | [email protected] |
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Umami | >= 3.1.0 (semver) |
CPE
Remediation
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 3, 2026 | New CVE Received | [email protected] |