Authorization Bypass in Hermes WebUI Affects Multiple User Profiles
CVE-2026-53871

8.6HIGH

Key Information:

Vendor

Nesquena

Status
Hermes-webui
Vendor
CVE Published:
17 June 2026

What is CVE-2026-53871?

Hermes WebUI before version 0.51.368 is susceptible to an authorization bypass due to a flaw in the get_profile_cookie() function. This vulnerability enables an attacker to exploit the system by sending a forged hermes_profile cookie. As a result, an authenticated attacker can bypass crucial profile-scoped authorization checks, granting them unauthorized access to user sessions, files, and resources across various profiles. This issue poses a serious risk by allowing an attacker to compromise isolated user data and functionalities.

Affected Version(s)

hermes-webui 0 < 0.51.368

hermes-webui 0.51.368

References

https://github.com/nesquena/hermes-webui/releases/tag/v0....
release-notes
https://github.com/nesquena/hermes-webui/pull/4023
technical-description
https://github.com/nesquena/hermes-webui/pull/4036
issue-tracking

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Chia Min Jun Lennon
.