CVE-2026-39998

MEDIUM EPSS 32.1%
Published Jun 19, 20261w ago · Modified Jun 23, 20266d ago
5.8 CVSS 4.0
Medium
Find Similar
Published Jun 19, 2026 1w ago
Last Modified Jun 23, 2026 6d ago

Description

Improper Input Validation vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to spoof identity headers. This issue affects Apache APISIX: from 2.12.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the issue.

CVSS Details

Base Score
5.8
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
32.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-20 Improper Input Validation Validation

Affected Products 1

VendorProductVersionRange
apacheapisix*≥2.12.0  –  <3.17.0

References 2

  • openwall.com http://www.openwall.com/lists/oss-security/2026/06/19/4
    Third Party Advisory
  • lists.apache.org https://lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvv
    Vendor AdvisoryMailing List

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.