Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M

CVE-2026-54728bunkerweb: Improper Input Validation and Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in BunkerWeb

Medium 6.1

In plain English

A medium-severity improper input validation in bunkerweb from bunkerity. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 4.0)6.1Medium

Exploit odds (30 days)0.4%top 67.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
bunkerity	bunkerweb	< 1.6.12

Weakness: CWE-20, CWE-74 · 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

References

https://github.com/bunkerity/bunkerweb/security/advisories/GHSA-254j-92cv-m443 x_refsource_CONFIRM
https://github.com/bunkerity/bunkerweb/commit/685ccbbe7d204132a843a7b7fd802d1bdb3f20a9 x_refsource_MISC
https://github.com/bunkerity/bunkerweb/releases/tag/v1.6.12 x_refsource_MISC