HOMEVULNERABILITIESCVE-2026-39998
HIGH

CVE-2026-39998

CWE-20Published: June 19, 2026· Updated: Jun 23, 2026

8.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-39998 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Apache1 product
apisix
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvv
ADVISORYhttp://www.openwall.com/lists/oss-security/2026/06/19/4

All References (2)

→
https://lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvvVendor Advisory · Mailing List
→
http://www.openwall.com/lists/oss-security/2026/06/19/4Third Party Advisory

Quick Facts

CVE IDCVE-2026-39998
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected1 vendor
PublishedJun 19, 2026

Related CVEs (CWE-20)

CVE-2026-47928
10.0
CVE-2026-34910
KEV10.0
CVE-2026-33587
10.0
CVE-2026-12537
10.0
CVE-2026-48055
10.0
CVE-2026-0848
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-39998 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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