CVE-2026-53871: Reliance on Cookies without Validation and Integrity Checking in nesquena hermes-webui
Hermes WebUI before 0.51.368 contains an authorization bypass vulnerability in the get_profile_cookie() function that accepts unauthenticated profile names from the hermes_profile cookie. An authenticated attacker can forge the hermes_profile cookie value to bypass profile-scoped authorization checks and access sessions, files, and resources across different profiles.
AI Analysis
Technical Summary
CVE-2026-53871 describes an authorization bypass vulnerability in nesquena's hermes-webui prior to version 0.51.368. The issue arises because the get_profile_cookie() function trusts the hermes_profile cookie value without validating or ensuring its integrity. An attacker with authentication can manipulate this cookie to impersonate other profiles, thereby bypassing authorization controls scoped to profiles and gaining unauthorized access to sessions, files, and resources belonging to other users.
Potential Impact
An authenticated attacker can bypass profile-based authorization controls by forging the hermes_profile cookie. This can lead to unauthorized access to sessions, files, and resources across different user profiles within the hermes-webui application. The vulnerability compromises the confidentiality and integrity of user data scoped by profile.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch is indicated, users should monitor the vendor's announcements for updates. Until a fix is available, restricting access to trusted users and minimizing exposure of the hermes_profile cookie may reduce risk.
CVE-2026-53871: Reliance on Cookies without Validation and Integrity Checking in nesquena hermes-webui
Description
Hermes WebUI before 0.51.368 contains an authorization bypass vulnerability in the get_profile_cookie() function that accepts unauthenticated profile names from the hermes_profile cookie. An authenticated attacker can forge the hermes_profile cookie value to bypass profile-scoped authorization checks and access sessions, files, and resources across different profiles.
CVSS v4.0
Score 8.6high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53871 describes an authorization bypass vulnerability in nesquena's hermes-webui prior to version 0.51.368. The issue arises because the get_profile_cookie() function trusts the hermes_profile cookie value without validating or ensuring its integrity. An attacker with authentication can manipulate this cookie to impersonate other profiles, thereby bypassing authorization controls scoped to profiles and gaining unauthorized access to sessions, files, and resources belonging to other users.
Potential Impact
An authenticated attacker can bypass profile-based authorization controls by forging the hermes_profile cookie. This can lead to unauthorized access to sessions, files, and resources across different user profiles within the hermes-webui application. The vulnerability compromises the confidentiality and integrity of user data scoped by profile.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch is indicated, users should monitor the vendor's announcements for updates. Until a fix is available, restricting access to trusted users and minimizing exposure of the hermes_profile cookie may reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-10T21:23:54.283Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a32e8dcf198dc38c1e39893
Added to database: 06/17/2026, 18:35:08 UTC
Last enriched: 07/15/2026, 10:11:52 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 81
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