CVE-2026-25555

critical · 9.3

A public exploit / detection template exists

Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →

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.

9.3

CVSS

1.8%

EPSS (exploit prob.)

78th

EPSS percentile

2026-06-08

Published

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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

Weaknesses

CWE-305

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-25555