Privilege escalation via private argument injection
Published Jun 23, 2026 · Updated Jun 23, 2026
Mass assignment in Ash 3.0.0 through 3.29.2 allows attackers to overwrite private action arguments through untrusted parameter maps. In Ash.Changeset, the binary-key lookup omits the public flag check, while atomic argument checks omit it for both atom and binary keys. Exploitation requires an action with a private argument reachable through attacker-controlled parameters and can alter authorization, identity, or ownership data.
Summary
What happened
Mass assignment in Ash 3.0.0 through 3.29.2 allows attackers to overwrite private action arguments through untrusted parameter maps. In Ash.Changeset, the binary-key lookup omits the public flag check, while atomic argument checks omit it for both atom and binary keys. Exploitation requires an action with a private argument reachable through attacker-controlled parameters and can alter authorization, identity, or ownership data.
The record
- CVE
- CVE-2026-55736
- Published
- Jun 23, 2026
- Updated
- Jun 23, 2026
- Vendor
- Ash Framework
- Product
- Ash
- Classifications
- CWE-915, T1068
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 23, 2026CVE publishedPublication date reported by the CVE source.
- Jun 23, 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=3.0.0 <3.29.3
- Affected versionversion=5967ed3a483ab949866e6d7b043b043e61703f17 <d9b3100219b3ea86d73202bf7368c03a7688efea
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
- Upstream private-argument injection proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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