Authenticated post disclosure via unchecked post ID
Published Oct 16, 2023 · Updated Apr 23, 2025
IDOR in Automattic ActivityPub before 1.0.0 allows remote authenticated users to read arbitrary draft and private post content. The parse-media-shortcode AJAX action accepts an attacker-chosen post_ID with an ap_content or ap_excerpt shortcode and returns the referenced post without checking that it is public and owned by the plugin. Subscriber access is sufficient; password-protected posts are excluded, and the demonstrated consequence is disclosure of otherwise nonpublic post content.
Summary
What happened
IDOR in Automattic ActivityPub before 1.0.0 allows remote authenticated users to read arbitrary draft and private post content. The parse-media-shortcode AJAX action accepts an attacker-chosen post_ID with an ap_content or ap_excerpt shortcode and returns the referenced post without checking that it is public and owned by the plugin. Subscriber access is sufficient; password-protected posts are excluded, and the demonstrated consequence is disclosure of otherwise nonpublic post content.
The record
- CVE
- CVE-2023-3707
- Published
- Oct 16, 2023
- Updated
- Apr 23, 2025
- Vendor
- Automattic
- Product
- ActivityPub
- Classifications
- CWE-639, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 16, 2023CVE publishedPublication date reported by the CVE source.
- Apr 23, 2025Record 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 <1.0.0
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
- WPScan parse-media-shortcode proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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