TI-2026-28781 Aliases CVE-2026-39908 GHSA-489c-3g86-35rh

OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source

LOW 33CWE-522Published 2026-06-08 · Updated 2026-07-14

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-522.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00824 57th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
openbullet	openbullet2	up to 0.3.2	—	No fix listed	CNA

openbullet2 Vendoropenbullet Affected up to 0.3.2 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-39908
2026-10-03 Alias added: GHSA-489c-3g86-35rh
2026-11-03 EPSS moved to the 50th–90th percentile

References

Exploit 1

https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2

TI-2026-20662 OpenBullet2 0.3.2 Authentication Bypass via X-Api-Key Header CVSS 4.0CRITICAL 9.3
TI-2026-20900 OpenBullet2 0.3.2 Authenticated RCE via Job Configuration Interface CVSS 4.0HIGH 8.7
TI-2026-20899 OpenBullet2 0.3.2 Authenticated RCE via FileProxySource Script Upload CVSS 4.0HIGH 8.7
TI-2026-20666 OpenBullet2 0.3.2 Path Traversal via Wordlist Endpoint CVSS 4.0HIGH 8.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences