Vulnerability DatabaseCVE-2026-55197
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-55197
Published:June 17, 2026
Updated:August 04, 2026
Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=<foreign_id>&messages=1 to retrieve unauthorized conversation transcripts and metadata.
Affected Packages
https://github.com/nesquena/hermes-webui.git (GITHUB):
Affected version(s) >=v0.12 <v0.51.443
Fix Suggestion:
Update to version v0.51.443
Related Resources (8)
https://github.com/nesquena/hermes-webui
https://github.com/nesquena/hermes-webui/pull/3982
https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71
https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443
https://github.com/nesquena/hermes-webui/pull/4269
https://www.vulncheck.com/advisories/hermes-webui-broken-access-control-in-api-session-endpoint
https://nvd.nist.gov/vuln/detail/CVE-2026-55197
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55197.json
Do you need more information?
Contact Us
CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
CWE-639
EPSS
Base Score:
0.27