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7.8

OpenBullet2 can leak Windows password hash

CVE-2026-39908 · published 4 months ago
Summary

If you use OpenBullet2 version 0.3.2 on Windows and set a proxy source to a network path (UNC) that you control, the program will try to connect to that path and automatically send its Windows authentication hash. An attacker who receives this hash can later reuse it to access other Windows resources or try to crack it. Update to a newer version or avoid using UNC paths for proxy sources to stop the leak.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
openbullet openbullet2 <= 0.3.2
Original advisory text
OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source
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
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
7.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-522Insufficiently Protected Credentials
Timeline
Published8 Jun 2026
Updated3 Nov 2026
First seen8 Jun 2026
Sources
CVE-2026-39908 · NVD
CVE-2026-39908 · MITRE
CVE-2026-39908 · OSV
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