CVE-2026-55197

Summary

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.

Affected Software

Weaknesses

• CWE-639: Authorization Bypass Through User-Controlled Key

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/nesquena/hermes-webui/pull/3982

References

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

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