---
cve: "CVE-2026-39998"
severity: "MEDIUM"
cvss: 5.8
epss: "40%"
vendor: "Apache Software Foundation"
kev: false
exploited: false
published: "2026-06-19 14:16:21"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T02:32:46+02:00"
---

# CVE-2026-39998

> 5.8 MEDIUM

## Beschreibung

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-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 9ef2ecab67f652d38365049613610ef649bb4ad0 (Commit)

## Referenzen

- <https://lists.apache.org/thread/vgkvy396010d7g6m0jrn4d3hjf2svlvv>
- <http://www.openwall.com/lists/oss-security/2026/06/19/4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-39998) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_