Vulnerability · Published Apr 21, 2026 · Assigned by VulnCheck

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

High 8.1

In plain English

A high-severity path traversal in hermes-webui from nesquena. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.5%top 58.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
nesquena	hermes-webui	0 – before PR #409

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References

Pull Request issue-tracking
Pull Request issue-tracking
Patch Commit patch
Release Notes third-party-advisory
Release Notes third-party-advisory
https://www.vulncheck.com/advisories/nesquena-hermes-webui-arbitrary-file-deletion-via-unvalidated-session-id third-party-advisory