Authorization Bypass in Fabio HTTP(S) and TCP Router by Fabiolb
CVE-2025-48865

9.1CRITICAL

Key Information:

Vendor

Fabiolb

Status
Fabio
Vendor
CVE Published:
30 May 2025

What is CVE-2025-48865?

Fabio, an HTTP(S) and TCP router for application deployment, contains a security vulnerability that allows clients to manipulate certain X-Forwarded headers, including the ability to remove them. This flaw arises due to inadequate validation of hop-by-hop headers, potentially leading to unauthorized access or misrouting of requests. The affected versions have been patched in version 1.6.6, which ensures that only trusted sources can modify these critical headers, thereby enhancing the security of backend applications.

Affected Version(s)

fabio < 1.6.6

References

https://github.com/fabiolb/fabio/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/fabiolb/fabio/commit/fdaf1e966162e9dd3...
x_refsource_MISC
https://github.com/fabiolb/fabio/releases/tag/v1.6.6
x_refsource_MISC

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-48865 : Authorization Bypass in Fabio HTTP(S) and TCP Router by Fabiolb