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Ash Framework CVE-2026-82748

| EUVDEUVD-2026-68952 LOW
Incorrect Authorization (CWE-863)
2026-09-01 EEF
2.1
CVSS 4.0 · Vendor: EEF

Severity by source

Vendor (EEF) PRIMARY
2.1 LOW
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
3.1 LOW

Network vector applies when the Ash API is exposed via web application; AC:H reflects the specific multi-action configuration required; PR:L because an application actor must initiate the aggregate call.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (EEF).

CVSS VectorVendor: EEF

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Metadata Corrected
Sep 01, 2026 - 04:40 vuln.today
tag: Authentication Bypass removed
Source Code Evidence Fetched
Sep 01, 2026 - 04:32 vuln.today
Analysis Generated
Sep 01, 2026 - 04:32 vuln.today

DescriptionCVE.org

Incorrect Authorization vulnerability in ash-project ash authorizes an aggregate under one read action while computing it under another, so an aggregate can run with policies that do not match the action it was authorized against.

Ash.Actions.Aggregate groups aggregates by their {authorize?, read_action} and authorizes each group under that read action, but when building the data query it selected the action as opts[:action] || read_action || <primary read> (lib/ash/actions/aggregate.ex). When a caller passed an :action option, the aggregate query ran under that action while authorization had been computed for the group's own read_action. If the run action's read policies are more permissive than the authorized one, the aggregate (a count or sum) is computed over records the authorized action's policies would have excluded, disclosing information about data the actor cannot read. The fix runs the aggregate under the same read_action it is authorized against.

This issue affects ash: from 3.5.13 before 3.32.2.

AnalysisAI

Incorrect authorization in the Ash Elixir framework (versions 3.5.13 through 3.32.2) allows aggregate queries to execute under a more permissive read action than the one used during the authorization check, disclosing aggregate-level statistics about records the actor is not permitted to access. The flaw lives in Ash.Actions.Aggregate, where the data-query builder honored an opts[:action] override that diverged from the read_action used to compute policy groups. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires three concurrent conditions: (1) the application uses the Ash aggregate API with a read_action whose read policies are restrictive, (2) the same aggregate call also receives an :action option pointing to a different read action with more permissive policies, and (3) an actor can trigger or influence that aggregate call. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The overall real-world risk is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade the Ash dependency to version 3.32.2 or later, which contains the one-line fix removing the opts[:action] override in the aggregate query builder; the exact patch commit is at https://github.com/ash-project/ash/commit/2d9b78b87d2dc72885a8aa1d660b478d42f749f7. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-82748 vulnerability details – vuln.today

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