Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in ash-project ash allows a user to set the value of a private action argument that is intended to be controlled only by trusted server-side code.
Action arguments declared with public?: false are meant to be set internally (for example via Ash.Changeset.set_private_argument/3) and must not be settable from end-user input. When a changeset is built from a parameter map, Ash filters out private arguments, but the filtering is incomplete.
In the regular changeset path (for_create, for_update, for_destroy), private arguments are stripped only when the parameter key is an atom. When the key is a binary (string), as is the case for user-supplied parameters, the private argument is kept and the user controls its value. In the atomic path (Ash.Changeset.fully_atomic_changeset/4, also reached through atomic and bulk updates), private arguments are not stripped at all, regardless of whether the key is an atom or a binary.
An attacker who can submit parameters to an action that defines a private argument can therefore inject a value for that argument. Depending on how the application uses the argument (for example an acting_user_id driving authorization or record ownership), this can lead to an integrity violation or privilege escalation.
This issue affects ash: from 3.0.0 before 3.29.3.
CVSS
No CVSS.
References
Configurations
No configuration.
History
09 Jul 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/ash-project/ash/security/advisories/GHSA-f4hc-ppw9-4hhw - |
23 Jun 2026, 19:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-23 19:17
Updated : 2026-07-09 16:16
NVD link : CVE-2026-55736
Mitre link : CVE-2026-55736
CVE.ORG link : CVE-2026-55736
JSON object : View
Products Affected
No product.
CWE
CWE-915
Improperly Controlled Modification of Dynamically-Determined Object Attributes