OAuth Single Sign On 6.25.0 - 7.0.0 - Unauthenticated Account Takeover via Unverified Steam OpenID Assertion
Priority LOW 37CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-287.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00383 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed OAuth Single Sign On (Unknown): 7.0.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Unknown | OAuth Single Sign On | 6.25.0 to before 7.0.1 | 7.0.1 | Patch available | CNA |
- OAuth Single Sign On VendorUnknown Affected 6.25.0 to before 7.0.1 Fixed in 7.0.1 Patch available CNA
Remediation
- Fix · CNA OAuth Single Sign On (Unknown) Fixed in 7.0.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-82183
- 2026-10-03 Alias added: GHSA-f9w9-q3c6-p58g
References
Sources
- CVE-2026-82183 · CVE Program
- CVE-2026-82183 · NVD
- FIRST EPSS
- GHSA-f9w9-q3c6-p58g · GitHub Advisory Database · CC BY 4.0
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