CVE-2026-39908
MEDIUMOpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Exploit technical-description
exploit
https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/openbullet2-ntlmv2-hash-disclosure-via-unc-path-proxy-source
Scores
CVSS v3
6.5
EPSS
0.0054
EPSS Percentile
40.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-522
Status
published
Products (1)
openbullet/openbullet2
< 0.3.2
Published
Jun 08, 2026
Tracked Since
Jun 08, 2026