CVE-2026-45727 HIGH

CVE-2026-45727: CloakBrowser: Unauthenticated path traversal via fingerprint parameter in cloakserve leads to arbitrary directory deletion

Vendor Cloakhq
Product CloakBrowser
Weakness CWE-22 · Path traversal
Published June 1, 2026
Last update June 1, 2026

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

CloakBrowser is a tool to bypass bot detection tests. Prior to version 0.3.28, the cloakserve CDP multiplexer uses the user-supplied fingerprint query parameter directly as a filesystem path component when creating Chrome profile directories. An unauthenticated attacker who can reach the cloakserve port can supply a crafted fingerprint value containing path traversal sequences to resolve user_data_dir outside the configured data_dir. When Chrome fails to start or the process is cleaned up, shutil.rmtree() deletes the traversed path, resulting in arbitrary directory deletion. Additionally, cloakserve bound to 0.0.0.0 by default, making it network-exposed. This issue has been patched in version 0.3.28.

Key dates

02Disclosure timeline

June 1, 2026 CVE published
June 1, 2026 Record updated