{"id":"CVE-2026-77454","state":"PUBLISHED","title":"exists/2 predicate silently dropped on limited relationships with a parent() filter in AshSql","description":"Incorrect Authorization vulnerability in ash-project ash_sql allows a caller to bypass a scoping or authorization filter expressed as exists/2 over a relationship that declares both a limit (or from_many?) and a parent(...)-referencing filter or sort.\n\nAshSql.Join.related_query/3 skips the caller-supplied exists predicate for such relationships and delegates it to limit_from_many/5. When the relationship's own filter or sort references parent(...), limit_from_many/5 takes a branch that drops both the limit and the predicate, emitting a bare correlated EXISTS with no predicate. The check then matches any record that has any related row. Most severely, when the expression backs a policy (for example authorize_if expr(exists(memberships, user_id == ^actor(:id)))), the actor-scoping condition disappears and the policy passes for any actor with any related row.\n\nThis issue affects ash_sql: from 0.4.1 before 0.7.1.","publishedAt":"2026-08-30T12:01:23.862Z","updatedAt":"2026-08-31T15:00:02.165Z","severity":{"score":5.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","source":"EEF"},"assigner":"EEF","products":["ash-project ash_sql"],"affected":[{"vendor":"ash-project","product":"ash_sql","packageName":"ash_sql","packageURL":"pkg:hex/ash_sql","defaultStatus":"unaffected","versions":[{"version":"0.4.1","status":"affected","lessThan":"0.7.1","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshSql.Join'"],"programFiles":["lib/join.ex"],"programRoutines":[{"name":"'Elixir.AshSql.Join':related_query/3"},{"name":"'Elixir.AshSql.Join':limit_from_many/5"}],"repo":"https://github.com/ash-project/ash_sql"},{"vendor":"ash-project","product":"ash_sql","packageName":"ash-project/ash_sql","packageURL":"pkg:github/ash-project/ash_sql","defaultStatus":"unaffected","versions":[{"version":"e26a63b29bd7501505fafd726f14262cdc3b6629","status":"affected","lessThan":"865fdd4e5e70724a23b19c048e6768c31d2209ab","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshSql.Join'"],"programFiles":["lib/join.ex"],"programRoutines":[{"name":"'Elixir.AshSql.Join':related_query/3"},{"name":"'Elixir.AshSql.Join':limit_from_many/5"}],"repo":"https://github.com/ash-project/ash_sql"}],"references":["https://github.com/ash-project/ash_sql/security/advisories/GHSA-8v9m-8pxv-738c","https://cna.erlef.org/cves/CVE-2026-77454.html","https://osv.dev/vulnerability/EEF-CVE-2026-77454","https://github.com/ash-project/ash_sql/commit/865fdd4e5e70724a23b19c048e6768c31d2209ab"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77454.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77454","state":"PUBLISHED","datePublished":"2026-08-30T12:01:23.862Z","dateUpdated":"2026-08-31T15:00:02.165Z","assignerShortName":"EEF","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateReserved":"2026-08-30T04:45:01.559Z"},"containers":{"cna":{"title":"exists/2 predicate silently dropped on limited relationships with a parent() filter in AshSql","descriptions":[{"lang":"en","value":"Incorrect Authorization vulnerability in ash-project ash_sql allows a caller to bypass a scoping or authorization filter expressed as exists/2 over a relationship that declares both a limit (or from_many?) and a parent(...)-referencing filter or sort.\n\nAshSql.Join.related_query/3 skips the caller-supplied exists predicate for such relationships and delegates it to limit_from_many/5. When the relationship's own filter or sort references parent(...), limit_from_many/5 takes a branch that drops both the limit and the predicate, emitting a bare correlated EXISTS with no predicate. The check then matches any record that has any related row. Most severely, when the expression backs a policy (for example authorize_if expr(exists(memberships, user_id == ^actor(:id)))), the actor-scoping condition disappears and the policy passes for any actor with any related row.\n\nThis issue affects ash_sql: from 0.4.1 before 0.7.1."}],"affected":[{"vendor":"ash-project","product":"ash_sql","packageName":"ash_sql","packageURL":"pkg:hex/ash_sql","defaultStatus":"unaffected","versions":[{"version":"0.4.1","status":"affected","lessThan":"0.7.1","versionType":"semver"}],"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshSql.Join'"],"programFiles":["lib/join.ex"],"programRoutines":[{"name":"'Elixir.AshSql.Join':related_query/3"},{"name":"'Elixir.AshSql.Join':limit_from_many/5"}],"repo":"https://github.com/ash-project/ash_sql"},{"vendor":"ash-project","product":"ash_sql","packageName":"ash-project/ash_sql","packageURL":"pkg:github/ash-project/ash_sql","defaultStatus":"unaffected","versions":[{"version":"e26a63b29bd7501505fafd726f14262cdc3b6629","status":"affected","lessThan":"865fdd4e5e70724a23b19c048e6768c31d2209ab","versionType":"git"}],"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*"],"modules":["'Elixir.AshSql.Join'"],"programFiles":["lib/join.ex"],"programRoutines":[{"name":"'Elixir.AshSql.Join':related_query/3"},{"name":"'Elixir.AshSql.Join':limit_from_many/5"}],"repo":"https://github.com/ash-project/ash_sql"}],"references":[{"url":"https://github.com/ash-project/ash_sql/security/advisories/GHSA-8v9m-8pxv-738c","tags":["vendor-advisory","related"]},{"url":"https://cna.erlef.org/cves/CVE-2026-77454.html","tags":["related"]},{"url":"https://osv.dev/vulnerability/EEF-CVE-2026-77454","tags":["related"]},{"url":"https://github.com/ash-project/ash_sql/commit/865fdd4e5e70724a23b19c048e6768c31d2209ab","tags":["patch"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":5.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","description":"CWE-863 Incorrect Authorization","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"EEF","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","dateUpdated":"2026-08-30T12:01:23.862Z"},"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>An application must use <code>exists/2</code> (in a filter or a policy) over a relationship that declares both a limit or <code>from_many?</code> and a filter or sort that references <code>parent(...)</code>. The predicate supplied to <code>exists/2</code> is the one that is dropped.</p>"},{"base64":false,"type":"text/markdown","value":"An application must use `exists/2` (in a filter or a policy) over a relationship that declares both a limit or `from_many?` and a filter or sort that references `parent(...)`. The predicate supplied to `exists/2` is the one that is dropped."}],"value":"An application must use exists/2 (in a filter or a policy) over a relationship that declares both a limit or from_many? and a filter or sort that references parent(...). The predicate supplied to exists/2 is the one that is dropped."}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*","versionEndExcluding":"0.7.1","versionStartIncluding":"0.4.1","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-1","descriptions":[{"lang":"en","value":"CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"}]}],"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/ash-project/ash_sql/security/advisories/GHSA-8v9m-8pxv-738c","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-31T14:59:41.075810Z","id":"CVE-2026-77454","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-31T15:00:02.165Z"}}]}}}