Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-82727.html
- https://github.com/ash-project/ash_phoenix/commit/0c1775c3cf8988f9abd10a8f92315a
- https://github.com/ash-project/ash_phoenix/security/advisories/GHSA-5xf4-hgcq-xw
- https://osv.dev/vulnerability/EEF-CVE-2026-82727
- https://github.com/ash-project/ash_phoenix/security/advisories/GHSA-5xf4-hgcq-xw
FAQ
What is CVE-2026-82727?
CVE-2026-82727 is a documented vulnerability. 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 alongsid...
How severe is CVE-2026-82727?
CVSS scoring is not yet available for CVE-2026-82727. Check NVD for updates.
Is there a patch for CVE-2026-82727?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.