by Kastro
Paper/Archive/CVE-2026-25555

CVE-2026-25555

openbullet openbullet2 — OpenBullet2 0.3.2 Authentication Bypass via X-Api-Key Header

EPSS 2%public exploitCVSS 9.8
critical.is priorityof 100
55
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 78.8.788 × 2015.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
openbullet2≤ 0.3.2–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploithackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2writeupvulncheck.com/advisories/openbullet2-authentication-bypass-via-x-api-key-header