CVE-2026-55197

HIGH EPSS 18.9%
Published Jun 17, 20261w ago · Modified Jun 17, 20261w ago
7.1 CVSS 4.0
High
Find Similar
Published Jun 17, 2026 1w ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.1
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
18.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-639

References 5

  • github.com https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71
  • github.com https://github.com/nesquena/hermes-webui/pull/3982
  • github.com https://github.com/nesquena/hermes-webui/pull/4269
  • github.com https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443
  • vulncheck.com https://www.vulncheck.com/advisories/hermes-webui-broken-access-control-in-api-session-endpoint

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.