CVE-2026-55736 (GCVE-0-2026-55736)
Vulnerability from cvelistv5 – Published: 2026-06-23 18:21 – Updated: 2026-07-10 04:34
VLAI
EPSS
VEX
Title
Private action arguments can be set by user input in Ash
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 14:53 UTC
CWE
- CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash/security/advis… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-55736.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-55736 | related |
| https://github.com/ash-project/ash/commit/d9b3100… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ash-project | ash |
Affected:
3.0.0 , < 3.29.3
(semver)
cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:* |
||
| ash-project | ash |
Affected:
5967ed3a483ab949866e6d7b043b043e61703f17 , < d9b3100219b3ea86d73202bf7368c03a7688efea
(git)
cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:* |
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"name": "\u0027Elixir.Ash.Changeset\u0027:cast_params/4"
},
{
"name": "\u0027Elixir.Ash.Changeset\u0027:get_action_argument/2"
},
{
"name": "\u0027Elixir.Ash.Changeset\u0027:atomic_params/4"
},
{
"name": "\u0027Elixir.Ash.Changeset\u0027:has_argument?/2"
}
],
"repo": "https://github.com/ash-project/ash",
"vendor": "ash-project",
"versions": [
{
"lessThan": "d9b3100219b3ea86d73202bf7368c03a7688efea",
"status": "affected",
"version": "5967ed3a483ab949866e6d7b043b043e61703f17",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn action must declare a private argument (one defined with \u003ctt\u003epublic?: false\u003c/tt\u003e) whose value is meant to be set only by trusted server-side code, and the application must build the changeset from untrusted user-supplied parameters, passing them straight into \u003ctt\u003eAsh.Changeset.for_create/3\u003c/tt\u003e, \u003ctt\u003efor_update/3\u003c/tt\u003e, \u003ctt\u003efor_destroy/3\u003c/tt\u003e, or into an atomic or bulk update.\u003c/p\u003e"
}
],
"value": "An action must declare a private argument (one defined with public?: false) whose value is meant to be set only by trusted server-side code, and the application must build the changeset from untrusted user-supplied parameters, passing them straight into Ash.Changeset.for_create/3, for_update/3, for_destroy/3, or into an atomic or bulk update."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*",
"versionEndExcluding": "3.29.3",
"versionStartIncluding": "3.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Alfred Vi\u00e9"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "Zach Daniel"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "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.\u003cp\u003eAction arguments declared with \u003ctt\u003epublic?: false\u003c/tt\u003e are meant to be set internally (for example via \u003ctt\u003eAsh.Changeset.set_private_argument/3\u003c/tt\u003e) 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.\u003c/p\u003e\u003cp\u003eIn the regular changeset path (\u003ctt\u003efor_create\u003c/tt\u003e, \u003ctt\u003efor_update\u003c/tt\u003e, \u003ctt\u003efor_destroy\u003c/tt\u003e), 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 (\u003ctt\u003eAsh.Changeset.fully_atomic_changeset/4\u003c/tt\u003e, 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.\u003c/p\u003e\u003cp\u003eAn 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 \u003ctt\u003eacting_user_id\u003c/tt\u003e driving authorization or record ownership), this can lead to an integrity violation or privilege escalation.\u003c/p\u003e\u003cp\u003eThis issue affects ash: from 3.0.0 before 3.29.3.\u003c/p\u003e"
}
],
"value": "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.\n\nAction 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.\n\nIn 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.\n\nAn 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.\n\nThis issue affects ash: from 3.0.0 before 3.29.3."
}
],
"impacts": [
{
"capecId": "CAPEC-77",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-77 Manipulating User-Controlled Variables"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "LOCAL",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-915",
"description": "CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-10T04:34:23.070Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/ash-project/ash/security/advisories/GHSA-f4hc-ppw9-4hhw"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-55736.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-55736"
},
{
"tags": [
"patch"
],
"url": "https://github.com/ash-project/ash/commit/d9b3100219b3ea86d73202bf7368c03a7688efea"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Private action arguments can be set by user input in Ash",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-55736",
"datePublished": "2026-06-23T18:21:13.033Z",
"dateReserved": "2026-06-17T10:44:34.365Z",
"dateUpdated": "2026-07-10T04:34:23.070Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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