CVE-2026-39998
Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
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.
- Record
CVE-2026-39998- CVSS 4.0
- 5.8 Medium
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 - Weakness
- CWE-20
- Updated
- 2026-11-02
EUVDEUVD-2026-38011
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.
- Record
EUVD-2026-38011- CVSS 4.0
- 5.8 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-86hq-f9pp-3cr9
Improper Input Validation vulnerability in Apache APISIX. The attacker can take advantage of...
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.
- Record
GHSA-86hq-f9pp-3cr9- CVSS 4.0
- 5.8 Medium
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 - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-39998- CVSS 4.0
- 5.8 Medium
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 - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
OSV
Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
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.
- Record
CVE-2026-39998- CVSS 4.0
- 5.8 Medium
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 - Weakness
- CWE-20
- Updated
- 2026-11-02
OSVBIT-apisix-2026-39998 No score
Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup
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.
- Record
BIT-apisix-2026-39998- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
apisixBitnami |
2.12.0 up to 3.17.0 | 3.17.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-39998 is a medium vulnerability (CVSS 5.8) in Apache Apisix, published June 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.68%, the 52nd percentile. Fixed in apisix 3.17.0.