Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| openbullet | openbullet2 | ≤ 0.3.2 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 1 module
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OpenBullet2 NTLMv2 Hash Disclosure via UNC Path Proxy Source
auxiliary/scanner/http/openbullet2_unauth_hash_disclosure_cve_2026_39908
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2 technical-description exploit
- https://www.vulncheck.com/advisories/openbullet2-ntlmv2-hash-disclosure-via-unc-path-proxy-source third-party-advisory