NTLMv2 hash disclosure via UNC proxy source
Published Jun 8, 2026 · Updated Jun 8, 2026
Credential disclosure in OpenBullet 2 through 0.3.2 on Windows allows remote attackers to capture the process user's NTLMv2 hash. A job proxy source accepts an attacker-controlled UNC path and reads it when the job starts, causing Windows to initiate SMB authentication. The attacker must be able to configure and start a job; the captured response supports offline cracking or credential relay.
Summary
What happened
Credential disclosure in OpenBullet 2 through 0.3.2 on Windows allows remote attackers to capture the process user's NTLMv2 hash. A job proxy source accepts an attacker-controlled UNC path and reads it when the job starts, causing Windows to initiate SMB authentication. The attacker must be able to configure and start a job; the captured response supports offline cracking or credential relay.
The record
- CVE
- CVE-2026-39908
- Published
- Jun 8, 2026
- Updated
- Jun 8, 2026
- Vendor
- OpenBullet
- Product
- OpenBullet 2
- Classifications
- CWE-522, T1187
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 8, 2026CVE publishedPublication date reported by the CVE source.
- Jun 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=0.3.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- CVE-2026-39908 Metasploit exploitfunctional · demonstrated
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Technologies
Your stack
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Your stack
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