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CVE-2026-55197

MEDIUM Exploitation: PoC
6.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-55197
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-06-16 15:53 UTC
Published
2026-06-17 17:59 UTC
Last updated
2026-06-17 18:51 UTC
Primary CWE
CWE-639
Authorization Bypass Through User-Controlled Key
Vendor / Product
nesquena / hermes-webui
Sources
cve.org  ·  NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
nesquena hermes-webui — 0 < 0.51.443, 0.51.443
Weakness (CWE)
CWESourceDescription
CWE-639 cna Authorization Bypass Through User-Controlled Key
CVSS scores (2)
ScoreSeverityVersionSourceVector
7.1 HIGH 4.0 cna 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
6.5 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
References (5)
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