How severe is CVE-2026-39999?

CVE-2026-39999 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-39999 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39999?

CVE-2026-39999 affects Apache Apisix. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39999?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-39999 have an EU (EUVD) identifier?

Yes. CVE-2026-39999 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38013.

When was CVE-2026-39999 published?

CVE-2026-39999 was published on 2026-06-19 and last updated on 2026-06-23.

CVE-2026-39999

CVE-2026-39999 is a critical-severity vulnerability in Apache Apisix with a CVSS 3.x base score of 9.1. 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-290.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 7.0
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38013
Weakness: CWE-290
Affected product: Apache Apisix
Published: 2026-06-19
Last modified: 2026-06-23

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.

Frequently asked questions

What is CVE-2026-39999?: 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.
How severe is CVE-2026-39999?: CVE-2026-39999 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-39999 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39999?: CVE-2026-39999 affects Apache Apisix. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39999?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-39999 have an EU (EUVD) identifier?: Yes. CVE-2026-39999 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38013.
When was CVE-2026-39999 published?: CVE-2026-39999 was published on 2026-06-19 and last updated on 2026-06-23.

References

Affected products (1)

cpe:2.3:a:apache:apisix:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Apisix

CVE-2022-25757 — Critical (CVSS 9.8): In Apache APISIX before 2.13.0, when decoding JSON with duplicate keys, lua-cjson will choose the last occurred value…
CVE-2022-24112 — Critical (CVSS 9.8): An attacker can abuse the batch-requests plugin to send requests to bypass the IP restriction of Admin API. A default…
CVE-2026-49871 — Critical (CVSS 9.3): Cross-Site Request Forgery (CSRF) vulnerability in the cas-auth plugin under default configurations. This defect…
CVE-2026-49230 — Critical (CVSS 9.1): Improper Validation of Integrity Check Value vulnerability in Apache APISIX. The jwe-decrypt plugin under default…
CVE-2026-44087 — Critical (CVSS 9.1): Insufficient Verification of Data Authenticity vulnerability in Apache APISIX. The openid-connect plugin under default…
CVE-2026-31908 — Critical (CVSS 9.1): Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in…

All CVEs affecting Apache Apisix →

Other CWE-290 vulnerabilities

CVE-2026-48567 — Critical (CVSS 10.0): Authentication bypass by spoofing in Azure HorizonDB allows an unauthorized attacker to elevate privileges over a…
CVE-2026-6213 — Critical (CVSS 10.0): A vulnerability in Remote Spark SparkView before build 1122 allows an attacker to bypasses the local connection check…
CVE-2026-39858 — Critical (CVSS 10.0): Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high…
CVE-2025-66570 — Critical (CVSS 10.0): cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability…
CVE-2025-34063 — Critical (CVSS 10.0): A cryptographic authentication bypass vulnerability exists in OneLogin AD Connector prior to 6.1.5 due to the exposure…
CVE-2023-22814 — Critical (CVSS 10.0): An authentication bypass issue via spoofing was discovered in the token-based authentication mechanism that could allow…

Browse all CWE-290 vulnerabilities →