CVE-2026-25555

CRITICAL 9.8

OpenBullet2 0.3.2 Authentication Bypass via X-Api-Key Header

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

OpenBullet2 through version 0.3.2 contains an authentication bypass vulnerability in the API key authentication middleware that allows unauthenticated attackers to gain admin access by supplying an empty X-Api-Key header value. Attackers can exploit the middleware's comparison of the supplied header against an empty AdminApiKey default string to access the admin console and all API endpoints without valid credentials.

CWE	CWE-305
Vendor	openbullet
Product	openbullet2
Published	Jun 8, 2026
Last Updated	Jun 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

openbullet / openbullet2

0 ≤ 0.3.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

hackernoon.com: https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2 vulncheck.com: https://www.vulncheck.com/advisories/openbullet2-authentication-bypass-via-x-api-key-header

Credits

Maksim Rogov VulnCheck