CVE-2026-22677 Hermes WebUI < 0.51.44 Path Traversal via Session Import Endpoint
Authenticated attackers can read arbitrary files via path traversal in the session import endpoint of Hermes WebUI.
- 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-2026-22677?
CVE-2026-22677 is a medium-severity path traversal vulnerability in nesquena hermes-webui, published on 13 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Hermes WebUI prior to 0.51.44 contains a path traversal vulnerability in the session import endpoint that allows authenticated attackers to read arbitrary files by importing a crafted session with an unrestricted workspace value. Attackers can supply a blocked filesystem root in the workspace field and subsequently use relative paths in the session file API to access any file readable by the WebUI process.
Weakness: CWE-22
Which versions are affected by CVE-2026-22677?
How do I fix CVE-2026-22677?
No fix has been published for CVE-2026-22677 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-22677 being exploited?
There is no known exploitation of CVE-2026-22677 in the wild and no public exploit code.
Sources
Also known as GHSA-wvw9-5wfm-7729.