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CVE-2026-49973

9.4 · CRITICAL

Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter…

Published Jun 11, 2026CWE-306EPSS 0.73%

Overview

CVE-2026-49973 is a critical-severity vulnerability. It was published on June 11, 2026 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08GitHubgithub.com/nesquena/hermes-webui/pull/3964GitHubgithub.com/nesquena/hermes-webui/pull/3973GitHubgithub.com/nesquena/hermes-webui/releases/tag/v0.51.358Refwww.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settingsGitHubgithub.com/nesquena/hermes-webui/pull/3964

How CyberStrike helps

Frequently asked questions

What is CVE-2026-49973?

CVE-2026-49973 is a critical-severity vulnerability. It was published on June 11, 2026 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

How severe is CVE-2026-49973?

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-49973?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-49973?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-49973 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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