PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-25855 openbullet CVE debrief

CVE-2026-25855 is a high-severity remote code execution vulnerability in OpenBullet2 through version 0.3.2. The vulnerability 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.

Vendor
openbullet
Product
openbullet2
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Users of OpenBullet2 version 0.3.2 or earlier should apply patches or mitigations to prevent exploitation of this vulnerability.

Technical summary

The vulnerability has a CVSS score of 8.7 and is classified as HIGH severity. The CVSS vector is CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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.

Defensive priority

high

Recommended defensive actions

  • Apply patches or updates to OpenBullet2 to prevent exploitation of this vulnerability.
  • Restrict access to the FileProxySource feature to only trusted users.
  • Monitor for suspicious activity related to script file uploads and execution.

Evidence notes

The CVE record and NVD detail can be found at resourceLinkAnnotations 'cve-org' and 'nvd'.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-25855 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-25855

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-25855 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-25855

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.