# CVE-2026-49872: Apache APISIX improper authentication in cas-auth plugin

Source: https://junglewise.ai/threats/cve-2026-49872-apache-apisix-improper-authentication-in-cas-auth-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-19. Updated: 2026-06-21  
License: CC BY 4.0 with a link back

CVE-2026-49872 · Severity: info · CVSS 5.3 · Published 2026-06-19

Apache APISIX is a cloud-native API gateway used to manage and secure web traffic. A security flaw in its Central Authentication Service (CAS) plugin allows an attacker to potentially bypass intended security checks by using credentials from an unauthorized source. This could allow unauthorized users to gain access to protected internal services and data.

Technologies: [Apache APISIX](https://junglewise.ai/threats/technologies/apisix). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-49872 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49872 being exploited in the wild.

**How severe is CVE-2026-49872?** Informational severity, with a CVSS score of 5.3, published 19 June 2026.

**Which products and versions are affected?** Apache APISIX 3.0.0 through 3.16.0.

**Is there a fix for CVE-2026-49872?** A patch was published on 2026-06-19: Fixed in version 3.17.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-49872 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-49872?** Check whether you run Apache APISIX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An improper authentication vulnerability (CWE-287) exists in the Apache APISIX cas-auth plugin. When the plugin is enabled on a route, the system fails to properly validate the source of authentication credentials, potentially allowing an attacker to provide valid credentials from a different, unintended source to gain access. The vulnerability is reachable over the network and requires the cas-auth plugin to be active. The issue is resolved in version 3.17.0.

## Affected products

- Apache APISIX 3.0.0 through 3.16.0

## Timeline

- 2026-06-19: disclosed
- 2026-06-19: advisory
- 2026-06-19: patched: Fixed in version 3.17.0

## References

- [https://lists.apache.org/thread/bzjpo60ygxo7kxdqf7vw3l5zw2lh6m5k](https://lists.apache.org/thread/bzjpo60ygxo7kxdqf7vw3l5zw2lh6m5k)
- [http://www.openwall.com/lists/oss-security/2026/06/19/15](http://www.openwall.com/lists/oss-security/2026/06/19/15)

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