{"id":80968,"date":"2026-06-23T21:51:13","date_gmt":"2026-06-23T18:21:13","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-55736-private-action-arguments-can-be-set-by-user-input-in-ash\/"},"modified":"2026-06-23T21:51:13","modified_gmt":"2026-06-23T18:21:13","slug":"cve-2026-55736-private-action-arguments-can-be-set-by-user-input-in-ash","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-55736-private-action-arguments-can-be-set-by-user-input-in-ash\/","title":{"rendered":"CVE-2026-55736 &#8211; Private action arguments can be set by user input in Ash"},"content":{"rendered":"<p>CVE ID :CVE-2026-55736<\/p>\n<p>  Published : June 23, 2026, 6:21 p.m. | 1\u00a0hour, 23\u00a0minutes ago<\/p>\n<p>  Description :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.<\/p>\n<p>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.<\/p>\n<p>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.<\/p>\n<p>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.<\/p>\n<p>This issue affects ash: from 3.0.0 before 3.29.3.<\/p>\n<p>  Severity: 5.9 | MEDIUM<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-55736 Published : June 23, 2026, 6:21 p.m. | 1\u00a0hour, 23\u00a0minutes ago Description :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 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-80968","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80968","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=80968"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80968\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=80968"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=80968"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=80968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}