What’s Vulnerable › Vulnerabilities

CVE-2026-6832: Nesquena Hermes WebUI Arbitrary File Deletion via Unvalidated session_id

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-21 · updated 2026-10-26
• Weakness: CWE-22

Description

Hermes WebUI contains an arbitrary file deletion vulnerability in the /api/session/delete endpoint that allows authenticated attackers to delete files outside the session directory by supplying an absolute path or path traversal payload in the session_id parameter. Attackers can exploit unvalidated session identifiers to construct paths that bypass the SESSION_DIR boundary and delete writable JSON files on the host system.

Affected products

• nesquena hermes-webui: before 0.50.32 — fixed in 0.50.32

How to fix

Upgrade to a fixed version: nesquena hermes-webui 0.50.32. Check the vendor advisory for mitigations.

References

• https://github.com/nesquena/hermes-webui/commit/3cc5839bf303fa6758bfdac538507407a2929655
• https://github.com/nesquena/hermes-webui/pull/409
• https://github.com/nesquena/hermes-webui/pull/412
• https://github.com/nesquena/hermes-webui/releases/tag/v0.50.132
• https://github.com/nesquena/hermes-webui/releases/tag/v0.50.32
• https://www.vulncheck.com/advisories/nesquena-hermes-webui-arbitrary-file-deletion-via-unvalidated-session-id

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