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Vulnerability Details :

CVE-2026-39908

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-08 Jun, 2026 | 16:47
Updated At-08 Jun, 2026 | 18:06
Rejected At-
Credits

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:08 Jun, 2026 | 16:47
Updated At:08 Jun, 2026 | 18:06
Rejected At:
▼CVE Numbering Authority (CNA)
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.

Affected Products
Vendor
openbullet
Product
openbullet2
Repo
https://github.com/openbullet/openbullet2
Default Status
affected
Versions
Affected
  • From 0 through 0.3.2 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-522Insufficiently Protected Credentials
Type: CWE
CWE ID: CWE-522
Description: Insufficiently Protected Credentials
Metrics
VersionBase scoreBase severityVector
4.07.1HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Version: 4.0
Base score: 7.1
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Maksim Rogov
finder
VulnCheck
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
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
Hyperlink: https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2
Resource:
technical-description
exploit
Hyperlink: https://www.vulncheck.com/advisories/openbullet2-ntlmv2-hash-disclosure-via-unc-path-proxy-source
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:08 Jun, 2026 | 17:16
Updated At:08 Jun, 2026 | 17:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.07.1HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Type: Secondary
Version: 4.0
Base score: 7.1
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-522Primarydisclosure@vulncheck.com
CWE ID: CWE-522
Type: Primary
Source: disclosure@vulncheck.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2disclosure@vulncheck.com
N/A
https://www.vulncheck.com/advisories/openbullet2-ntlmv2-hash-disclosure-via-unc-path-proxy-sourcedisclosure@vulncheck.com
N/A
Hyperlink: https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://www.vulncheck.com/advisories/openbullet2-ntlmv2-hash-disclosure-via-unc-path-proxy-source
Source: disclosure@vulncheck.com
Resource: N/A

Change History

0
Information is not available yet

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