CVE-2026-55198
published 2026-06-17CVE-2026-55198: Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint Hermes WebUI before 0.51.443 contains an authorization bypass…
high7.1CVSS 4.0
AVNACLATNPRLUINVCHVINVANSCNSINSAN
EPSS
0.27%
18.9th percentile
Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint
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.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| nesquena | hermes-webui | < 0.51.443 | 0.51.443 |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
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.
ghsa_unreviewed·2026-06-17
CVE-2026-55198 [HIGH] CWE-639 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.
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.
CVEList
Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint
cvelistv5·2026-06-17·CVSS 7.1
CVE-2026-55198 [HIGH] CWE-639 Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint
Hermes WebUI < 0.51.443 - Cross-Profile Session Data Exfiltration via Session Export Endpoint
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.
VulDB
nesquena hermes-webui up to 0.51.442 Session Export Endpoint api/routes.py authorization (EUVD-2026-37779)
vuldb·2026-06-17
CVE-2026-55198 [LOW] nesquena hermes-webui up to 0.51.442 Session Export Endpoint api/routes.py authorization (EUVD-2026-37779)
A vulnerability was found in nesquena hermes-webui up to 0.51.442. It has been rated as problematic. This affects an unknown part of the file api/routes.py of the component Session Export Endpoint. Performing a manipulation results in authorization bypass.
This vulnerability is cataloged as CVE-2026-55198. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is advised.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-06-17
Published