CVE-2026-55198

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 an authorization bypass vulnerability in the session export endpoint that allows authenticated users to access sessions from other profiles. The _handle_session_export handler in api/routes.py fails to verify active-profile ownership before serializing session data, enabling attackers to exfiltrate foreign session transcripts by guessing or knowing session identifiers.

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/3991
  • 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-cross-profile-session-data-exfiltration-via-session-export-endpoint

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.