Unauthenticated field disclosure via projection bypass
Published Apr 15, 2026 · Updated Apr 15, 2026
Incorrect authorization in ApostropheCMS 4.28.0 and earlier allows remote attackers to read restricted fields through the REST API. In @apostrophecms/piece-type getRestQuery, applyBuildersSafely accepts a project parameter before authorization, so populated projection state skips publicApiProjection. Exploitation requires a publicly queryable piece type with publicApiProjection configured; document permissions still prevent access to otherwise inaccessible documents.
Summary
What happened
Incorrect authorization in ApostropheCMS 4.28.0 and earlier allows remote attackers to read restricted fields through the REST API. In @apostrophecms/piece-type getRestQuery, applyBuildersSafely accepts a project parameter before authorization, so populated projection state skips publicApiProjection. Exploitation requires a publicly queryable piece type with publicApiProjection configured; document permissions still prevent access to otherwise inaccessible documents.
The record
- CVE
- CVE-2026-33888
- Published
- Apr 15, 2026
- Updated
- Apr 15, 2026
- Vendor
- ApostropheCMS
- Product
- ApostropheCMS
- Classifications
- CWE-863, CWE-200, T1213, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 15, 2026CVE publishedPublication date reported by the CVE source.
- Apr 15, 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=< 4.29.0
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
- GHSA-xhq9-58fw-859p REST projection-bypass proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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