{"id":"EEF-CVE-2026-81852","summary":"AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass","details":"## Summary\n\nUse 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.\n\n## Configurations\n\nThe application mounts AshAdmin without `:csp_nonce_assign_key` and enforces a nonce-based CSP whose `script-src` allow-lists the default `ash_admin-Ed55GFnX` value, and has a separate HTML-injection sink on an admin page.","aliases":["CVE-2026-81852","GHSA-whfj-rrrp-j597"],"modified":"2026-09-08T03:45:07.038727695Z","published":"2026-08-31T02:29:14.304Z","database_specific":{"capec_ids":["CAPEC-63"],"cpe_ids":["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-330"]},"references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_admin/security/advisories/GHSA-whfj-rrrp-j597"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-81852.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_admin/commit/bc7a1cdf873b16971a8efec35d085f8bb706314f"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_admin"}],"affected":[{"package":{"name":"ash_admin","ecosystem":"Hex","purl":"pkg:hex/ash_admin"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.10.8"},{"fixed":"1.3.1"}]}],"versions":["0.10.10","0.10.10-rc.0","0.10.10-rc.1","0.10.11","0.10.12","0.10.8","0.10.9","0.11.0","0.11.1","0.11.10","0.11.11","0.11.2","0.11.3","0.11.4","0.11.5","0.11.6","0.11.7","0.11.8","0.11.9","0.12.0","0.12.1","0.12.2","0.12.3","0.12.4","0.12.5","0.12.6","0.13.0","0.13.1","0.13.10","0.13.11","0.13.12","0.13.13","0.13.14","0.13.15","0.13.16","0.13.17","0.13.18","0.13.19","0.13.2","0.13.20","0.13.21","0.13.22","0.13.23","0.13.24","0.13.25","0.13.26","0.13.3","0.13.4","0.13.5","0.13.6","0.13.7","0.13.8","0.13.9","0.14.0","1.0.0-rc.0","1.1.0","1.2.0","1.3.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-81852.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_admin","events":[{"introduced":"99b8daed7b2f79d82fcd9e89338d41b0e1564aa7"},{"fixed":"bc7a1cdf873b16971a8efec35d085f8bb706314f"}]}],"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://cna.erlef.org/osv/EEF-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"}],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Peter Ullrich","type":"REPORTER"},{"name":"Zach Daniel / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}]}