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CVE-2026-39999

Apache Apisix authentication bypass

9.1 CRITICALEPSS 0.64%
  1. Published19 Jun 2026

Description

Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0. Users are recommended to upgrade to version v3.17.0, which fixes the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Apisix≥ 2.2 < 3.17.0

Remediation

Fixed in
Apache Apisix≥ 3.17.0

References

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Frequently asked

Is CVE-2026-39999 being actively exploited?

CVE-2026-39999 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.64%.

How severe is CVE-2026-39999?

CVE-2026-39999 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.64% probability of exploitation.

Which products are affected by CVE-2026-39999?

Affected products include Apache Apisix.

How do I fix CVE-2026-39999?

Upgrade affected software to a fixed version, for example Apache Apisix 3.17.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39999 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.