What’s Vulnerable › Vulnerabilities

CVE-2026-39908: OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-522

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

• openbullet2: through 0.3.2

References

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

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