VulnerabilityAnalyzed
CVE-2026-39998
Improper Input Validation vulnerability in Apache APISIX.
MEDIUM 5.8EPSS 0.68%
Does this matter?
Lower severity and a low EPSS score (0.68%). Track it; it rarely justifies an emergency change on its own.
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 4.0
- 5.8 MEDIUMCVSS: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/M
- EPSS
- 0.68% probability · 50th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- apache/apisix
- Source
- security@apache.org
References
- https://lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvvVendor Advisory, Mailing List
- http://www.openwall.com/lists/oss-security/2026/06/19/4Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.