RCE in Openbullet Openbullet2
CVE-2026-25855
OpenBullet2 through version 0.3.2 contains a remote code execution vulnerability that allows authenticated users to execute arbitrary commands by uploading script files (.bat.ps1.sh) through the FileProxySource proxy loading feature. Attackers can upload malicious script files as proxy sources, causing the server to execute the scripts and return output as proxy lines, resulting in arbitrary command execution on the host as the process user.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.011 · change: +0.005
Affected products
- Openbullet Openbullet2 — versions 0.2.5
Weakness classification (CWE)
References
- hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2 (technical-description, exploit)
- www.vulncheck.com/advisories/openbullet2-authenticated-rce-via-fileproxysource-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-25855?
- CVE-2026-25855 is a high-severity vulnerability in Openbullet Openbullet2, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-06-08.
- How severe is CVE-2026-25855?
- High severity. CVSS v3 base score is 8.8 out of 10.