{"id":"CVE-2026-81852","state":"PUBLISHED","title":"AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass","description":"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 <style> and <script> 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.","publishedAt":"2026-08-31T02:29:14.304Z","updatedAt":"2026-08-31T15:59:44.933Z","severity":{"score":2.1,"label":"Low","version":"4.0","vector":"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","source":"EEF"},"assigner":"EEF","products":["ash-project ash_admin"],"affected":[{"vendor":"ash-project","product":"ash_admin","packageName":"ash_admin","packageURL":"pkg:hex/ash_admin","defaultStatus":"unaffected","versions":[{"version":"0.10.8","status":"affected","lessThan":"1.3.1","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAdmin.Router'","'Elixir.AshAdmin.Layouts'"],"programFiles":["lib/ash_admin/router.ex","lib/ash_admin/components/layouts.ex"],"repo":"https://github.com/ash-project/ash_admin"},{"vendor":"ash-project","product":"ash_admin","packageName":"ash-project/ash_admin","packageURL":"pkg:github/ash-project/ash_admin","defaultStatus":"unaffected","versions":[{"version":"99b8daed7b2f79d82fcd9e89338d41b0e1564aa7","status":"affected","lessThan":"bc7a1cdf873b16971a8efec35d085f8bb706314f","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAdmin.Router'","'Elixir.AshAdmin.Layouts'"],"programFiles":["lib/ash_admin/router.ex","lib/ash_admin/components/layouts.ex"],"repo":"https://github.com/ash-project/ash_admin"}],"references":["https://github.com/ash-project/ash_admin/security/advisories/GHSA-whfj-rrrp-j597","https://cna.erlef.org/cves/CVE-2026-81852.html","https://osv.dev/vulnerability/EEF-CVE-2026-81852","https://github.com/ash-project/ash_admin/commit/bc7a1cdf873b16971a8efec35d085f8bb706314f"],"weaknesses":["CWE-330"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/81xxx/CVE-2026-81852.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-81852","state":"PUBLISHED","datePublished":"2026-08-31T02:29:14.304Z","dateUpdated":"2026-08-31T15:59:44.933Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-08-30T23:15:02.378Z"},"containers":{"cna":{"title":"AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass","descriptions":[{"lang":"en","value":"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 <style> and <script> 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."}],"affected":[{"vendor":"ash-project","product":"ash_admin","packageName":"ash_admin","packageURL":"pkg:hex/ash_admin","defaultStatus":"unaffected","versions":[{"version":"0.10.8","status":"affected","lessThan":"1.3.1","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAdmin.Router'","'Elixir.AshAdmin.Layouts'"],"programFiles":["lib/ash_admin/router.ex","lib/ash_admin/components/layouts.ex"],"repo":"https://github.com/ash-project/ash_admin"},{"vendor":"ash-project","product":"ash_admin","packageName":"ash-project/ash_admin","packageURL":"pkg:github/ash-project/ash_admin","defaultStatus":"unaffected","versions":[{"version":"99b8daed7b2f79d82fcd9e89338d41b0e1564aa7","status":"affected","lessThan":"bc7a1cdf873b16971a8efec35d085f8bb706314f","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshAdmin.Router'","'Elixir.AshAdmin.Layouts'"],"programFiles":["lib/ash_admin/router.ex","lib/ash_admin/components/layouts.ex"],"repo":"https://github.com/ash-project/ash_admin"}],"references":[{"url":"https://github.com/ash-project/ash_admin/security/advisories/GHSA-whfj-rrrp-j597","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-81852.html","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-81852","tags":["related"]},{"url":"https://github.com/ash-project/ash_admin/commit/bc7a1cdf873b16971a8efec35d085f8bb706314f","tags":["patch"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.1,"baseSeverity":"LOW","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-330","description":"CWE-330 Use of Insufficiently Random Values","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"EEF","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateUpdated":"2026-08-31T02:29:14.304Z"},"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>The application mounts AshAdmin without <code>:csp_nonce_assign_key</code> and enforces a nonce-based CSP whose <code>script-src</code> allow-lists the default <code>ash_admin-Ed55GFnX</code> value, and has a separate HTML-injection sink on an admin page.</p>"},{"base64":false,"type":"text/markdown","value":"The 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."}],"value":"The 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."}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*","versionEndExcluding":"1.3.1","versionStartIncluding":"0.10.8","vulnerable":true}],"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 Männchen / EEF"}],"impacts":[{"capecId":"CAPEC-63","descriptions":[{"lang":"en","value":"CAPEC-63 Cross-Site Scripting (XSS)"}]}],"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/ash-project/ash_admin/security/advisories/GHSA-whfj-rrrp-j597","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-31T15:59:13.805623Z","id":"CVE-2026-81852","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-31T15:59:44.933Z"}}]}}}