Unauthenticated token injection via unchecked OpenID callback
Published Apr 8, 2026 · Updated Apr 8, 2026
Missing authorization in linkPizza-Manager 5.5.5 and earlier allows remote attackers to inject an OAuth token through its OpenID callback. The OpenID callback handler accepts a token without checking the caller's WordPress capability, while the authentication handler also lacks capability and nonce checks. No account or user interaction is required, and successful exploitation changes the plugin's LinkPizza authentication state rather than exposing or disrupting the host.
Summary
What happened
Missing authorization in linkPizza-Manager 5.5.5 and earlier allows remote attackers to inject an OAuth token through its OpenID callback. The OpenID callback handler accepts a token without checking the caller's WordPress capability, while the authentication handler also lacks capability and nonce checks. No account or user interaction is required, and successful exploitation changes the plugin's LinkPizza authentication state rather than exposing or disrupting the host.
The record
- CVE
- CVE-2026-39682
- Published
- Apr 8, 2026
- Updated
- Apr 8, 2026
- Vendor
- Arjan Pronk
- Product
- linkPizza-Manager
- Classifications
- CWE-862, CAPEC-180
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 8, 2026CVE publishedPublication date reported by the CVE source.
- Apr 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=5.5.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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