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 | CPE status | |
|---|---|---|---|---|
| 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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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.\", \"supportingMedia\": [{\"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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-209\", \"description\": \"CWE-209 Generation of Error Message Containing Sensitive Information\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The application renders an AshPhoenix.Form with a union field, and submitted params (which may carry secrets) reach logs, crash reports or the error page.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe application renders an \u003ccode\u003eAshPhoenix.Form\u003c/code\u003e with a union field, and submitted params (which may carry secrets) reach logs, crash reports or the error page.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The application renders an `AshPhoenix.Form` with a union field, and submitted params (which may carry secrets) reach logs, crash reports or the error page.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.3.25\", \"versionStartIncluding\": \"1.2.17\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-08-31T03:03:58.982Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-82727\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-31T14:49:25.154Z\", \"dateReserved\": \"2026-08-31T00:59:08.960Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-08-31T03:03:58.982Z\", \"assignerShortName\": \"EEF\"}",
"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.
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.
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