Description
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.
CVSS breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality (Vulnerable System)
High
Integrity (Vulnerable System)
None
Availability (Vulnerable System)
None
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
None
Availability (Subsequent System)
None
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected products
- nesquena / hermes-webui0 – 0.51.443
- nesquena / hermes-webui0.51.443 – 0.51.443
References
- PATCHhttps://github.com/nesquena/hermes-webui/releases/tag/v0.51.443
- PATCHhttps://github.com/nesquena/hermes-webui/pull/3982
- PATCHhttps://github.com/nesquena/hermes-webui/pull/4269
- PATCHhttps://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71
- VENDOR_ADVISORYhttps://www.vulncheck.com/advisories/hermes-webui-broken-access-control-in-api-session-endpoint