Contributor audience disclosure via REST checks
Published Aug 20, 2026 · Updated Aug 20, 2026
Authorization bypass in Roxnor GutenKit before 2.5.0 allows remote authenticated users to read Mailchimp audience metadata via REST endpoints. The flaw is in Mailchimp-related REST API routes that apply an insufficient capability check, so Contributor-level accounts can query connected marketing-account audience details that should be restricted. Reachability requires a valid WordPress account with the Contributor role or higher and a site that has configured the GutenKit Mailchimp integration; the published impact is limited to disclosure of audience metadata.
Summary
What happened
Authorization bypass in Roxnor GutenKit before 2.5.0 allows remote authenticated users to read Mailchimp audience metadata via REST endpoints. The flaw is in Mailchimp-related REST API routes that apply an insufficient capability check, so Contributor-level accounts can query connected marketing-account audience details that should be restricted. Reachability requires a valid WordPress account with the Contributor role or higher and a site that has configured the GutenKit Mailchimp integration; the published impact is limited to disclosure of audience metadata.
The record
- CVE
- CVE-2026-19699
- Published
- Aug 20, 2026
- Updated
- Aug 20, 2026
- Vendor
- Roxnor
- Product
- GutenKit
- Classifications
- CWE-863
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 20, 2026CVE publishedPublication date reported by the CVE source.
- Aug 20, 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=2.4.12 <2.5.0
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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