{"id":"CVE-2026-81852","summary":"AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass","details":"Use of Insufficiently Random Values vulnerability in ash-project ash_admin ships a hardcoded, publicly known CSP nonce, defeating nonce-based Content-Security-Policy protection.\n\nWhen mounted without :csp_nonce_assign_key, AshAdmin.Router.ash_admin/2 defaulted the img, style, and script nonces to the literal constant ash_admin-Ed55GFnX, which AshAdmin.Layouts wrote verbatim into the nonce attribute of its inline \u003cstyle\u003e and \u003cscript\u003e tags on every response. The value is a compile-time constant published in the repository and is never rotated per request. If an application's CSP script-src allow-lists that documented default, any HTML-injection sink on an admin page can reuse the known nonce to run inline scripts the policy was meant to block. The fix generates a fresh random nonce per request.\n\nThis issue affects ash_admin: from 0.10.8 before 1.3.1.","aliases":["EEF-CVE-2026-81852","GHSA-whfj-rrrp-j597"],"modified":"2026-09-03T03:30:38.992633521Z","published":"2026-08-31T02:29:14.304Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81852.json","unresolved_ranges":[{"extracted_events":[{"introduced":"99b8daed7b2f79d82fcd9e89338d41b0e1564aa7"},{"fixed":"bc7a1cdf873b16971a8efec35d085f8bb706314f"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"EEF","cwe_ids":["CWE-330"]},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-81852.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-81852"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81852.json"},{"type":"ADVISORY","url":"https://github.com/ash-project/ash_admin/security/advisories/GHSA-whfj-rrrp-j597"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81852"},{"type":"FIX","url":"https://github.com/ash-project/ash_admin/commit/bc7a1cdf873b16971a8efec35d085f8bb706314f"},{"type":"PACKAGE","url":"https://github.com/ash-project/ash_admin"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_admin","events":[{"introduced":"4028b200cfef3fc88cff5daa0bafb8f496d3a0e3"},{"fixed":"91da87c1c23cd6199ba1b0a1c8849a4c605130cc"},{"fixed":"bc7a1cdf873b16971a8efec35d085f8bb706314f"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0.10.8"},{"fixed":"1.3.1"}]}}],"versions":["v1.3.0","v1.2.0","v1.1.0","v0.14.0","v0.13.26","v0.13.25","v0.13.24","v0.13.23","v0.13.22","v0.13.21","v0.13.20","v0.13.19","v0.13.18","v0.13.17","v0.13.16","v0.13.15","v0.13.14","v0.13.13","v0.13.12","v0.13.11","v0.13.10","v0.13.9","v0.13.8","v0.13.7","v0.13.6","v0.13.5","v0.13.4","v0.13.3","v0.13.2","v0.13.0","v0.12.6","v0.12.5","v0.12.4","v0.12.3","v0.12.2","v0.12.1","v0.12.0","v0.11.11","v0.11.10","v0.11.9","v0.11.8","v0.11.7","v0.11.6","v0.11.4","v0.11.3","v0.11.2","v0.11.1","v0.10.10","v0.10.10-rc.1","v0.10.10-rc.0","v0.10.9","v0.10.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81852.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}