Auth bypass in Oauth Single Sign On

CVE-2026-82183

The OAuth Single Sign On WordPress plugin before 7.0.1 does not verify the identity assertion returned by its Steam single sign-on flow, allowing unauthenticated attackers to log in as an arbitrary non-administrator user, and to create new accounts.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (30.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-82183: held from 0.002 to 0.004.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

  • Oauth Single Sign On

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-82183?
CVE-2026-82183 is a high-severity vulnerability in Oauth Single Sign On, classified under Improper Authentication. CVSS score: 8.1/10. Published 2026-09-02.
How severe is CVE-2026-82183?
High severity. CVSS v3 base score is 8.1 out of 10.