CVE-2026-54728CWE-20CWE-74

bunkerweb: Improper Input Validation and Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in BunkerWeb

Medium · published July 16, 2026

CVSS v4.0
6.1
EPSS
0%
Percentile
30.9
In the wild
Unconfirmed
What it is

bunkerweb is an Open-source and next-generation Web Application Firewall (WAF). Prior to BunkerWeb 1.6.12 and BunkerWeb PRO 0.57, authenticated Host header handling in the BunkerWeb UI and API improperly validated and neutralized user-controlled input in a configuration-dependent path, allowing a low-privileged authenticated user to escalate privileges and affect confidentiality, integrity, and availability of the BunkerWeb instance. This issue is fixed in BunkerWeb version 1.6.12 and BunkerWeb PRO version 0.57.

The record
Technical detail
CVSS v4.0
6.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00381 · 30.9th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Published
2026-07-16T19:18Z
EPSS history
Timeline
  • 16 JUL 19:18Z
    bunkerweb: Improper Input Validation and Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in BunkerWeb
    cvelistv5