Apache APISIX up to 3.16.0 Upstream Service authentication spoofing

Summaryinfo

A vulnerability, which was classified as critical, has been found in Apache APISIX up to 3.16.0. Affected by this issue is some unknown functionality of the component Upstream Service. This manipulation causes authentication spoofing. This vulnerability appears as CVE-2026-49231. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apache APISIX up to 3.16.0. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Upstream Service. The manipulation with an unknown input leads to a authentication spoofing vulnerability. The CWE definition for the vulnerability is CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Authentication Bypass by Spoofing vulnerability in opa plugin. An attacker could relay spoofed identity headers to upstream capitalising on non-default configuration in opa plugin. This could allow the attacker to assume higher privileges on the upstream service. This issue affects Apache APISIX: from 3.5.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the issue.

The advisory is shared at lists.apache.org. This vulnerability is known as CVE-2026-49231 since 05/28/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/19/2026).

Upgrading to version 3.17.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38020). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Apache

Name

• APISIX

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16.0

License

• open-source

Website

• Vendor: https://www.apache.org/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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