How severe is CVE-2026-78560?

CVE-2026-78560 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-78560 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-78560?

CVE-2026-78560 affects Okta Access Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-78560?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-78560 published?

CVE-2026-78560 was published on 2026-09-08 and last updated on 2026-09-23.

CVE-2026-78560

CVE-2026-78560 is a medium-severity vulnerability in Okta Access Gateway with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Okta Access Gateway
Published: 2026-09-08
Last modified: 2026-09-23

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.

Frequently asked questions

What is CVE-2026-78560?: 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.
How severe is CVE-2026-78560?: CVE-2026-78560 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-78560 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-78560?: CVE-2026-78560 affects Okta Access Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-78560?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-78560 published?: CVE-2026-78560 was published on 2026-09-08 and last updated on 2026-09-23.

References

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

Affected products (1)

cpe:2.3:a:okta:access_gateway:*:*:*:*:*:*:*:*

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