CVE-2026-110616: Missing Auth (CVSS 8.1)

Description

NullHub through 2026.5.29 contains a missing authentication vulnerability that allows unauthenticated attackers to access the /api/* management API because the auth_token field defaults to null and is never assigned. Attackers sending requests without Authorization or Origin headers to non-loopback listeners can control agent instances, rewrite configurations including provider credentials, and manage cron jobs and MCP servers.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0081

Probability of exploitation

0.56%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-306 Missing Authentication

References

Other References

https://github.com/nullclaw/nullhub https://github.com/nullclaw/nullhub/blob/v2026.5.29/Dockerfile#L69-L71 https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/api/settings.zig#L29-L54 https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/server.zig#L546-L556 https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJrLma3izg https://www.vulncheck.com/advisories/nullhub-through-2026.5.29-missing-authentication-for-api-management-api

Frequently Asked Questions

What is CVE-2026-110616? +

NullHub through 2026.5.29 contains a missing authentication vulnerability that allows unauthenticated attackers to access the /api/* management API because the auth_token field defaults to null and is never assigned. Attackers sending requests without Authorization or Origin headers to non-loopback listeners can control agent instances, rewrite configurations including provider credentials, and manage cron jobs and MCP servers. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-110616? +

CVE-2026-110616 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0081, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-110616? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-110616