CVE-2026-39908

MEDIUM 6.5

OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-522
Vendor	openbullet
Product	openbullet2
Published	Jun 8, 2026
Last Updated	Jun 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

openbullet / openbullet2

0 ≤ 0.3.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hackernoon.com: https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2 vulncheck.com: https://www.vulncheck.com/advisories/openbullet2-ntlmv2-hash-disclosure-via-unc-path-proxy-source

Credits

Maksim Rogov VulnCheck