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CVE-2026-55197

Hermes WebUI < 0.51.443 - Broken Access Control in /api/session Endpoint

CVSS 4.0 7.1 HIGHCVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-55197

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-55197

Published

hermes-webui

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nesquena",
                    "product": "hermes-webui",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/nesquena/hermes-webui",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "0.51.443"
                        },
                        {
                            "version": "0.51.443",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ],
                    "repo": "https://github.com/nesquena/hermes-webui"
                }

Original source record · Cite this exact observation · Complete original publisher JSON