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TI-2026-20900 Aliases CVE-2026-25856GHSA-w8vj-qcv3-4w36

OpenBullet2 0.3.2 Authenticated RCE via Job Configuration Interface

Priority HIGH 73CWE-94Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

OpenBullet2 through version 0.3.2 contains an authenticated remote code execution vulnerability that allows authenticated users to execute arbitrary C# code on the server host by creating or modifying job configurations. Attackers can leverage the plain C# execution mode, which lacks reference filtering or API restrictions, to access the file system, spawn processes, and invoke arbitrary .NET APIs as the process user.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01088 65th 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
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
openbulletopenbullet2up to 0.3.2—No fix listedCNA
  • openbullet2 Vendoropenbullet Affected up to 0.3.2 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25856
  2. 2026-10-03 Alias added: GHSA-w8vj-qcv3-4w36
  3. 2026-10-25 EPSS moved to the below the 50th percentile
  4. 2026-11-03 EPSS moved to the 50th–90th percentile

References

Exploit 1

  • TI-2026-20662 OpenBullet2 0.3.2 Authentication Bypass via X-Api-Key Header CVSS 4.0CRITICAL 9.3
  • 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
  • TI-2026-28781 OpenBullet2 0.3.2 NTLMv2 Hash Disclosure via UNC Path Proxy Source CVSS 4.0HIGH 7.1

Sources

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