Critical 9.8Published Jun 8, 2026

CVE-2026-25555OpenBullet2 0.3.2 Authentication Bypass via X-Api-Key Header

Updated under an hour ago (Oct 26, 2026, 8:00 PM ET)

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It affects openbullet2. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-305
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

openbullet openbullet2 openbullet:openbullet2 (from the name)	through 0.3.2	CNA record

References

References

https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2	technical-description, exploit
https://www.vulncheck.com/advisories/openbullet2-authentication-bypass-via-x-api-key-header	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.