CVE-2026-53871 Hermes WebUI < 0.51.368 - Profile-Scoped Authorization Bypass via Forged hermes_profile Cookie
An authenticated attacker can forge the hermes_profile cookie to bypass authorization checks and access resources across different user profiles.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53871?
CVE-2026-53871 is a high-severity authentication bypass vulnerability in nesquena hermes-webui, published on 17 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-565
Which versions are affected by CVE-2026-53871?
How do I fix CVE-2026-53871?
No fix has been published for CVE-2026-53871 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-53871 being exploited?
There is no known exploitation of CVE-2026-53871 in the wild and no public exploit code.
Sources
Also known as GHSA-cpcp-57xw-48rv.