Apache APISIX Header Injection via forward-auth plugin 2.12.0-3.15.0
CVE-2026-31908 Published on April 14, 2026

Apache APISIX: forward auth plugin allows header injection
Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-31908 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Type

What is a Special Element Injection Vulnerability?

The software does not adequately filter user-controlled input for special elements with control implications.

CVE-2026-31908 has been classified to as a Special Element Injection vulnerability or weakness.


Products Associated with CVE-2026-31908

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Apache Apisix
 

Affected Versions

Apache Software Foundation Apache APISIX:

Exploit Probability

EPSS
0.03%
Percentile
8.03%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.