CVE-2026-39908CWE-522

OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source

High · published June 8, 2026

CVSS v4.0
7.1
EPSS
1%
Percentile
44.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
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
EPSS
0.00540 · 44.6th percentile
Weakness
CWE-522 · Insufficiently Protected Credentials
Published
2026-06-08T16:47Z
EPSS history
Timeline
  • 08 JUN 16:47Z
    OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source
    cvelistv5