Unauthorized post publishing via deficient REST permissions
Published Jun 26, 2026 · Updated Jun 26, 2026
Missing authorization in Nelio Content 4.3.4 and earlier allows remote authenticated users to modify posts through its REST API. The post endpoint's permission checks accept Contributor capabilities for create or edit operations without separately requiring permission to publish, edit others' posts, or assign another author. Contributor-level access and a valid WordPress REST nonce are required; successful requests can create or alter posts under another user's identity and publish them.
Summary
What happened
Missing authorization in Nelio Content 4.3.4 and earlier allows remote authenticated users to modify posts through its REST API. The post endpoint's permission checks accept Contributor capabilities for create or edit operations without separately requiring permission to publish, edit others' posts, or assign another author. Contributor-level access and a valid WordPress REST nonce are required; successful requests can create or alter posts under another user's identity and publish them.
The record
- CVE
- CVE-2026-57648
- Published
- Jun 26, 2026
- Updated
- Jun 26, 2026
- Vendor
- Nelio Software
- Product
- Nelio Content
- Classifications
- CWE-862, CAPEC-180, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 26, 2026CVE publishedPublication date reported by the CVE source.
- Jun 26, 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=n/a <=4.3.4 changes=[{"at":"4.3.5","status":"unaffected"}]
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
- Atomic Edge PHP proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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