CVE-2026-82727 (GCVE-0-2026-82727)
Vulnerability from cvelistv5 – Published: 2026-08-31 03:03 – Updated: 2026-08-31 14:49
VLAI
EPSS
VEX
Title
AshPhoenix Form.Auto leaks submitted params in an unknown _union_type error message
Summary
Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_phoenix writes the entire raw submitted param map into an exception message, so secrets submitted alongside a union form field leak into logs, crash reports and the dev error page.
When AshPhoenix.Form.Auto builds a union sub-form and the submitted _union_type does not match a configured type, both raise sites built the message with inspect(params, pretty: true), embedding the full untrusted param map, and also inspected the internal union constraints[:types]. Because the message is constructed by the library rather than Phoenix's parameter logger, config :phoenix, :filter_parameters never redacts it. An attacker controls both the trigger and the contents: submitting %{"_union_type" => "nope", "password" => "..."} puts the password verbatim in the raised message. The fix reports only the offending _union_type and the valid type names, dropping the param and constraints dumps.
This issue affects ash_phoenix: from 1.2.17 before 2.3.25.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 14:49 UTC
CWE
- CWE-209 - Generation of Error Message Containing Sensitive Information
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_phoenix/securi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-82727.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-82727 | related |
| https://github.com/ash-project/ash_phoenix/commit… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| ash-project | ash_phoenix |
Affected:
1.2.17 , < 2.3.25
(semver)
cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:* |
|
| ash-project | ash_phoenix |
Affected:
a3436fcc321e3b34c242cceaf62c3c92bc1a452b , < 0c1775c3cf8988f9abd10a8f92315afc5f06f16d
(git)
cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:* |
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"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Zach Daniel / Ash Project"
},
{
"lang": "en",
"type": "coordinator",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eGeneration of Error Message Containing Sensitive Information vulnerability in ash-project ash_phoenix writes the entire raw submitted param map into an exception message, so secrets submitted alongside a union form field leak into logs, crash reports and the dev error page.\u003c/p\u003e\n\u003cp\u003eWhen \u003ccode\u003eAshPhoenix.Form.Auto\u003c/code\u003e builds a union sub-form and the submitted \u003ccode\u003e_union_type\u003c/code\u003e does not match a configured type, both raise sites built the message with \u003ccode\u003einspect(params, pretty: true)\u003c/code\u003e, embedding the full untrusted param map, and also inspected the internal union \u003ccode\u003econstraints[:types]\u003c/code\u003e. Because the message is constructed by the library rather than Phoenix\u0027s parameter logger, \u003ccode\u003econfig :phoenix, :filter_parameters\u003c/code\u003e never redacts it. An attacker controls both the trigger and the contents: submitting \u003ccode\u003e%{\"_union_type\" =\u0026gt; \"nope\", \"password\" =\u0026gt; \"...\"}\u003c/code\u003e puts the password verbatim in the raised message. The fix reports only the offending \u003ccode\u003e_union_type\u003c/code\u003e and the valid type names, dropping the param and constraints dumps.\u003c/p\u003e\n\u003cp\u003eThis issue affects ash_phoenix: from 1.2.17 before 2.3.25.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_phoenix writes the entire raw submitted param map into an exception message, so secrets submitted alongside a union form field leak into logs, crash reports and the dev error page.\n\nWhen `AshPhoenix.Form.Auto` builds a union sub-form and the submitted `_union_type` does not match a configured type, both raise sites built the message with `inspect(params, pretty: true)`, embedding the full untrusted param map, and also inspected the internal union `constraints[:types]`. Because the message is constructed by the library rather than Phoenix\u0027s parameter logger, `config :phoenix, :filter_parameters` never redacts it. An attacker controls both the trigger and the contents: submitting `%{\"_union_type\" =\u003e \"nope\", \"password\" =\u003e \"...\"}` puts the password verbatim in the raised message. The fix reports only the offending `_union_type` and the valid type names, dropping the param and constraints dumps.\n\nThis issue affects ash_phoenix: from 1.2.17 before 2.3.25."
}
],
"value": "Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_phoenix writes the entire raw submitted param map into an exception message, so secrets submitted alongside a union form field leak into logs, crash reports and the dev error page.\n\nWhen AshPhoenix.Form.Auto builds a union sub-form and the submitted _union_type does not match a configured type, both raise sites built the message with inspect(params, pretty: true), embedding the full untrusted param map, and also inspected the internal union constraints[:types]. Because the message is constructed by the library rather than Phoenix\u0027s parameter logger, config :phoenix, :filter_parameters never redacts it. An attacker controls both the trigger and the contents: submitting %{\"_union_type\" =\u003e \"nope\", \"password\" =\u003e \"...\"} puts the password verbatim in the raised message. The fix reports only the offending _union_type and the valid type names, dropping the param and constraints dumps.\n\nThis issue affects ash_phoenix: from 1.2.17 before 2.3.25."
}
],
"impacts": [
{
"capecId": "CAPEC-54",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-54 Query System for Information"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 2.3,
"baseSeverity": "LOW",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-209",
"description": "CWE-209 Generation of Error Message Containing Sensitive Information",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-31T03:03:58.982Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/ash-project/ash_phoenix/security/advisories/GHSA-5xf4-hgcq-xw7v"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-82727.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-82727"
},
{
"tags": [
"patch"
],
"url": "https://github.com/ash-project/ash_phoenix/commit/0c1775c3cf8988f9abd10a8f92315afc5f06f16d"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "AshPhoenix Form.Auto leaks submitted params in an unknown _union_type error message"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-82727",
"datePublished": "2026-08-31T03:03:58.982Z",
"dateReserved": "2026-08-31T00:59:08.960Z",
"dateUpdated": "2026-08-31T14:49:25.154Z",
"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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