# CVE-2026-25555: OpenBullet2 authentication bypass in API key middleware

Source: https://junglewise.ai/threats/cve-2026-25555-openbullet2-authentication-bypass-in-api-key-middleware  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-08. Updated: 2026-06-08  
License: CC BY 4.0 with a link back

CVE-2026-25555 · Severity: critical · CVSS 9.8 · Published 2026-06-08

OpenBullet2, a popular automation suite for web testing, contains a flaw that allows unauthorized individuals to gain full administrative control. By sending a specifically crafted empty header in a web request, an attacker can bypass security checks and access the admin console and all private data. This could lead to a total compromise of the application, including the theft of sensitive configurations and service disruption.

Technologies: [OpenBullet2](https://junglewise.ai/threats/technologies/openbullet2). Vendors: [OpenBullet2](https://junglewise.ai/threats/vendors/openbullet2).

## Quick answers

**Is CVE-2026-25555 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25555 being exploited in the wild.

**How severe is CVE-2026-25555?** Critical severity, with a CVSS score of 9.8, published 8 June 2026.

**Which products and versions are affected?** OpenBullet2 through 0.3.2.

**Is there a fix for CVE-2026-25555?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-25555 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-25555?** Check whether you run OpenBullet2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An authentication bypass vulnerability exists in the API key authentication middleware of OpenBullet2 versions up to and including 0.3.2. The root cause is a logic error where the middleware compares a user-supplied 'X-Api-Key' header against a default 'AdminApiKey' string that may be empty. By providing an empty value in the 'X-Api-Key' header, a remote, unauthenticated attacker can satisfy the authentication condition. Successful exploitation grants full access to the administrative console and all API endpoints, allowing for complete system takeover.

## Affected products

- OpenBullet2 OpenBullet2 through 0.3.2

## Timeline

- 2026-06-08: advisory: NVD and VulnCheck published the advisory

## References

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

## Related threats

- [OpenBullet2 NTLMv2 hash disclosure via UNC path proxy source](https://junglewise.ai/threats/cve-2026-39908-openbullet2-ntlmv2-hash-disclosure-via-unc-path-proxy-source)
- [OpenBullet2 authenticated remote code execution in job configurations](https://junglewise.ai/threats/cve-2026-25856-openbullet2-authenticated-remote-code-execution-in-job)
- [OpenBullet2 remote code execution in FileProxySource](https://junglewise.ai/threats/cve-2026-25855-openbullet2-remote-code-execution-in-fileproxysource)
- [OpenBullet2 path traversal in wordlist endpoint](https://junglewise.ai/threats/cve-2026-25559-openbullet2-path-traversal-in-wordlist-endpoint)