What is CVE-2026-37171?

CVE-2026-37171 is a medium-severity vulnerability in Supertokens, classified under Incorrect Authorization. CVSS score: 5.9/10. Published 2026-08-07.

How severe is CVE-2026-37171?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Auth bypass in Supertokens

CVE-2026-37171

A lack of tenant separation in SuperTokens Inc. SuperTokens Core v6.0.0 to v11.4.0 allows an authenticated party in one tenant to access sessions, data, and endpoints of another tenant.

Vulnerability class: Broken Access Control

Published 2026-08-07 · last modified 2026-10-30.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (16.9th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.001

Affected products

Supertokens

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

whitenbaker.com/supertokens-core-multitenant-advisory (Exploit, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-37171?: CVE-2026-37171 is a medium-severity vulnerability in Supertokens, classified under Incorrect Authorization. CVSS score: 5.9/10. Published 2026-08-07.
How severe is CVE-2026-37171?: Medium severity. CVSS v3 base score is 5.9 out of 10.