Vulnerability in Nesquena Hermes-Webui
CVE-2026-53871
Hermes WebUI before 0.51.368 contains an authorization bypass vulnerability in the get_profile_cookie() function that accepts unauthenticated profile names from the hermes_profile cookie. An authenticated attacker can forge the hermes_profile cookie value to bypass profile-scoped authorization checks and access sessions, files, and resources across different profiles.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Nesquena Hermes-Webui — versions 0, 0.51.368
Weakness classification (CWE)
References
- github.com/nesquena/hermes-webui/releases/tag/v0.51.368 (release-notes)
- github.com/nesquena/hermes-webui/pull/4023 (issue-tracking, technical-description, patch)
- github.com/nesquena/hermes-webui/pull/4036 (issue-tracking, patch)
- github.com/nesquena/hermes-webui/commit/9e96f5f6adf93b6d1e27ebddfb4d2833ca06ff3b (patch)
- www.vulncheck.com/advisories/hermes-webui-profile-scoped-authorization-bypass-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53871?
- CVE-2026-53871 is a high-severity vulnerability in Nesquena Hermes-Webui, classified under Reliance on Cookies without Validation and Integrity Checking. CVSS score: 8.1/10. Published 2026-06-17.
- How severe is CVE-2026-53871?
- High severity. CVSS v3 base score is 8.1 out of 10.