What is CVE-2026-31813?

CVE-2026-31813 is a medium-severity vulnerability in Supabase Auth, classified under Authentication Bypass by Spoofing. CVSS score: 4.8/10. Published 2026-03-11.

How severe is CVE-2026-31813?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Supabase Auth

CVE-2026-31813

Supabase Auth is a JWT based API for managing users and issuing JWT tokens. Prior to 2.185.0, a vulnerability has been identified that allows an attacker to issue sessions for arbitrary users using specially crafted ID tokens when the Appl…

EPSS: 0.000 (13.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Supabase Auth — versions < 2.185.0

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

https://github.com/supabase/auth/security/advisories/GHSA-v36f-qvww-8w8m (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-31813?: CVE-2026-31813 is a medium-severity vulnerability in Supabase Auth, classified under Authentication Bypass by Spoofing. CVSS score: 4.8/10. Published 2026-03-11.
How severe is CVE-2026-31813?: Medium severity. CVSS v3 base score is 4.8 out of 10.