CVE-2026-39908 HIGH

CVE-2026-39908: OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source

Vendor Openbullet
Product openbullet2
Weakness CWE-522 · Insufficiently protected credentials
Published June 8, 2026
Last update June 8, 2026

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

OpenBullet2 through version 0.3.2 on Windows contains a credential disclosure vulnerability that allows remote attackers to capture the NTLMv2 hash of the process user by configuring a job proxy source with a UNC path pointing to an attacker-controlled server. When the job starts, the application attempts to load proxies from the UNC path, triggering an SMB authentication attempt that discloses the NTLMv2 hash, which can then be relayed or cracked offline.

Key dates

02Disclosure timeline

June 8, 2026 CVE published
June 8, 2026 Record updated