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CVE-2026-49957

7.7 · HIGH

Hermes WebUI before version 0.51.296 contains a workspace boundary bypass vulnerability that allows authenticated attackers to circumvent blocked-root path checks by exploiting an early return in t…

Published Jun 9, 2026CWE-22EPSS 0.51%

Overview

CVE-2026-49957 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Hermes WebUI before version 0.51.296 contains a workspace boundary bypass vulnerability that allows authenticated attackers to circumvent blocked-root path checks by exploiting an early return in the SSH/remote terminal profile workspace resolution logic within _remote_terminal_workspace_candidate(). Attackers can configure a remote terminal working directory to a system directory such as /etc, causing the workspace resolution path to accept it as a trusted local workspace root before the _is_blocked_workspace_path() guard executes, enabling read access to local system files through workspace file-read helpers.

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/91a89fb5d5c0bf87932917f9914ad0150ea62fe4GitHubgithub.com/nesquena/hermes-webui/pull/3731GitHubgithub.com/nesquena/hermes-webui/pull/3744GitHubgithub.com/nesquena/hermes-webui/releases/tag/v0.51.296Refwww.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-py

How CyberStrike helps

Frequently asked questions

What is CVE-2026-49957?

CVE-2026-49957 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2026-49957?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-49957?

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-2026-49957?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-49957 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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