CVE-2026-58122 (GCVE-0-2026-58122)

Vulnerability from cvelistv5 – Published: 2026-07-09 21:30 – Updated: 2026-07-09 21:30 X_Open Source
VLAI
Title
Hermes WebUI < 0.51.307 Authentication Bypass via X-Forwarded-For Header Spoofing
Summary
Hermes WebUI before 0.51.307 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to circumvent local-origin IP restrictions on onboarding endpoints by supplying a spoofed X-Forwarded-For header with a loopback address. Attackers can exploit this bypass to perform server-side request forgery against internal services including cloud metadata endpoints, overwrite LLM provider configuration and API keys with attacker-controlled values, or initiate OAuth device-code flows to obtain persistent access tokens stored in auth.json.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-348 - Use of Less Trusted Source
Assigner
References
Impacted products
Vendor Product Version
nesquena hermes-webui Affected: 0 , < 0.51.307 (semver)
Create a notification for this product.
Date Public
2026-06-06 00:00
Credits
fantasticsquirrel
Show details on NVD website
To clipboard 

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        {
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          "product": "hermes-webui",
          "repo": "https://github.com/nesquena/hermes-webui",
          "vendor": "nesquena",
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              "status": "affected",
              "version": "0",
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            }
          ]
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      ],
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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
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              "description": "Use of Less Trusted Source",
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      "providerMetadata": {
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        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
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      "references": [
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          "name": "Release Notes",
          "tags": [
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          "url": "https://github.com/nesquena/hermes-webui/releases/tag/v0.51.307"
        },
        {
          "name": "Pull Request",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/nesquena/hermes-webui/pull/3758"
        },
        {
          "name": "Patch Commit",
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          "url": "https://github.com/nesquena/hermes-webui/commit/70596e6993be0d4cee083c1c1a86f5e7ad5d57b7"
        },
        {
          "tags": [
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          ],
          "url": "https://www.vulncheck.com/advisories/hermes-webui-authentication-bypass-via-x-forwarded-for-header-spoofing"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "Hermes WebUI \u003c 0.51.307 Authentication Bypass via X-Forwarded-For Header Spoofing",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-58122",
    "datePublished": "2026-07-09T21:30:17.166Z",
    "dateReserved": "2026-06-29T14:13:18.384Z",
    "dateUpdated": "2026-07-09T21:30:17.166Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.