Find a vulnerability

{
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              "content": {
                "id": "CVE-2026-90898",
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                "timestamp": "2026-09-14T11:01:44.207374Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-09-14T11:19:46.276Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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      "affected": [
        {
          "collectionURL": "https://github.com/maximhq/bifrost",
          "defaultStatus": "unaffected",
          "modules": [
            "transports/bifrost-http",
            "core/mcp"
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          "packageName": "github.com/maximhq/bifrost/transports",
          "platforms": [
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            "macOS"
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            "transports/bifrost-http/handlers/mcp.go",
            "transports/bifrost-http/handlers/middlewares.go"
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          "repo": "git://github.com/maximhq/bifrost",
          "vendor": "maximhq",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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              "type": "text/html",
              "value": "\u003cp\u003eManagement API reachable and governance.auth_config.is_enabled=false, which is the documented default. Confirmed on maximhq/bifrost v1.6.3. Fixed in transports/v2.1.0 (2026-09-08). An operator who enables management authentication and keeps the admin listener off untrusted networks is not exposed to the unauthenticated form of this issue.\u003c/p\u003e"
            }
          ],
          "value": "Management API reachable and governance.auth_config.is_enabled=false, which is the documented default. Confirmed on maximhq/bifrost v1.6.3. Fixed in transports/v2.1.0 (2026-09-08). An operator who enables management authentication and keeps the admin listener off untrusted networks is not exposed to the unauthenticated form of this issue."
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          "type": "finder",
          "value": "Yuval Moravchick | JFrog"
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      ],
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        {
          "lang": "en",
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              "value": "\u003cp\u003eBifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway the moment the client is added. No MCP handshake required.\u003c/p\u003e\u003cp\u003eThe default is governance.auth_config.is_enabled=false. Auth off means every caller is a local admin. One unauthenticated POST /api/mcp/client is enough to run a program as the Bifrost process user (appuser on the official image).\u003c/p\u003e\u003cp\u003e\u0026nbsp;transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it.\u003c/p\u003e"
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          ],
          "value": "Bifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway the moment the client is added. No MCP handshake required.\n\n\n\nThe default is governance.auth_config.is_enabled=false. Auth off means every caller is a local admin. One unauthenticated POST /api/mcp/client is enough to run a program as the Bifrost process user (appuser on the official image).\n\n\n\n\u00a0transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it."
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              "value": "\u003cp\u003eJFrog has a private proof of concept. An unauthenticated POST /api/mcp/client with connection_type stdio and attacker-chosen command and args starts the program in the gateway. Public exploit details are not included in this record.\u003c/p\u003e"
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          "value": "JFrog has a private proof of concept. An unauthenticated POST /api/mcp/client with connection_type stdio and attacker-chosen command and args starts the program in the gateway. Public exploit details are not included in this record."
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
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              "cweId": "CWE-306",
              "description": "CWE-306 Missing Authentication for Critical Function",
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        },
        {
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              "description": "CWE-284 Improper Access Control",
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              "type": "CWE"
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        "orgId": "48a46f29-ae42-4e1d-90dd-c1676c1e5e6d",
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      "references": [
        {
          "name": "PR #6757: refuse unauthenticated stdio MCP registration",
          "tags": [
            "patch"
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          "url": "https://github.com/maximhq/bifrost/pull/6757"
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          "name": "Merge commit for PR #6757",
          "tags": [
            "patch"
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          "url": "https://github.com/maximhq/bifrost/commit/12e170352bd25eab1ae9ba16611f1797d1fd8fdc"
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          "name": "Bifrost HTTP v2.1.0 (first release containing the fix)",
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              "value": "\u003cp\u003eUpgrade Bifrost HTTP transport to 2.1.0 or later. PR #6757 returns 403 for unauthenticated stdio MCP client registration when dashboard authentication is disabled or unconfigured. Authenticated admins can still add stdio clients. The 1.6.x line through 1.6.11 and transports/v2.0.0 do not include this change.\u003c/p\u003e"
            }
          ],
          "value": "Upgrade Bifrost HTTP transport to 2.1.0 or later. PR #6757 returns 403 for unauthenticated stdio MCP client registration when dashboard authentication is disabled or unconfigured. Authenticated admins can still add stdio clients. The 1.6.x line through 1.6.11 and transports/v2.0.0 do not include this change."
        }
      ],
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        "discovery": "EXTERNAL"
      },
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          "lang": "en",
          "time": "2026-07-13T10:27:00.000Z",
          "value": "Reported to the Bifrost maintainers (GHSA-86gf-xh3g-rvxq)"
        },
        {
          "lang": "en",
          "time": "2026-09-02T15:14:00.000Z",
          "value": "Fix merged upstream (PR #6757)"
        },
        {
          "lang": "en",
          "time": "2026-09-08T15:15:00.000Z",
          "value": "Fix first shipped in Bifrost HTTP v2.1.0"
        }
      ],
      "title": "Bifrost unauthenticated remote code execution via MCP stdio client registration",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
              "value": "\u003cp\u003eSet governance.auth_config.is_enabled to true, use strong administrator credentials, and firewall the management listener.\u0026nbsp;\u003c/p\u003e"
            }
          ],
          "value": "Set governance.auth_config.is_enabled to true, use strong administrator credentials, and firewall the management listener."
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    "cveId": "CVE-2026-90898",
    "datePublished": "2026-09-14T10:18:53.454Z",
    "dateReserved": "2026-09-14T10:13:28.161Z",
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    "adp": [
      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-86242",
                "options": [
                  {
                    "Exploitation": "none"
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T18:23:19.631126Z",
                "version": "2.0.3"
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              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-09-08T18:23:28.573Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/maximhq/bifrost",
          "defaultStatus": "unaffected",
          "modules": [
            "transports/bifrost-http",
            "framework/plugins"
          ],
          "packageName": "github.com/maximhq/bifrost/transports",
          "platforms": [
            "Linux",
            "macOS"
          ],
          "product": "Bifrost",
          "programFiles": [
            "transports/bifrost-http/handlers/plugins.go",
            "transports/bifrost-http/handlers/middlewares.go",
            "framework/plugins/soloader.go"
          ],
          "repo": "git://github.com/maximhq/bifrost",
          "vendor": "maximhq",
          "versions": [
            {
              "changes": [
                {
                  "at": "2.0.0-prerelease3",
                  "status": "unaffected"
                }
              ],
              "lessThan": "2.0.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAffects dynamically linked Bifrost binaries that can load Go plugins (DYNAMIC=1), with the management API reachable and governance.auth_config.is_enabled=false (default at disclosure). Linux and macOS only (Go plugin package). The default statically linked Docker image is not RCE-capable; that build class is SSRF only. Confirmed on maximhq/bifrost v1.6.3 for the download-then-plugin.Open path. End-to-end malicious .so load against a DYNAMIC=1 binary was not completed in lab; the RCE score is for the documented custom-plugin build class where plugin.Open is expected to succeed.\u003c/p\u003e"
            }
          ],
          "value": "Affects dynamically linked Bifrost binaries that can load Go plugins (DYNAMIC=1), with the management API reachable and governance.auth_config.is_enabled=false (default at disclosure). Linux and macOS only (Go plugin package). The default statically linked Docker image is not RCE-capable; that build class is SSRF only. Confirmed on maximhq/bifrost v1.6.3 for the download-then-plugin.Open path. End-to-end malicious .so load against a DYNAMIC=1 binary was not completed in lab; the RCE score is for the documented custom-plugin build class where plugin.Open is expected to succeed."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Or Peles"
        },
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          "lang": "en",
          "type": "coordinator",
          "value": "JFrog Security Research"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eBifrost HTTP transport before 2.0.0 accepts an enabled custom plugin whose path is an HTTP URL through unauthenticated POST /api/plugins when management authentication is disabled (the default, governance.auth_config.is_enabled=false). The shared-object loader treats an http-prefixed path as a download URL, writes the body to a temporary .so, and passes it to Go\u0027s plugin.Open. After a successful open, optional Init runs immediately with the supplied config as the Bifrost process user. On documented dynamically linked builds (DYNAMIC=1 / no static-link flags), which the vendor requires for custom Go plugins, plugin.Open is expected to succeed and this is unauthenticated remote code execution. On the published statically linked Docker image, plugin.Open fails with Dynamic loading not supported, so that build class is only server-side request forgery. Attack complexity is High because the attacker cannot force RCE on the default static image and a loadable plugin must match the host Go version, OS, architecture, and linkage. The 1.6.x HTTP transport line through 1.6.11 does not contain the fix.\u003c/p\u003e"
            }
          ],
          "value": "Bifrost HTTP transport before 2.0.0 accepts an enabled custom plugin whose path is an HTTP URL through unauthenticated POST /api/plugins when management authentication is disabled (the default, governance.auth_config.is_enabled=false). The shared-object loader treats an http-prefixed path as a download URL, writes the body to a temporary .so, and passes it to Go\u0027s plugin.Open. After a successful open, optional Init runs immediately with the supplied config as the Bifrost process user. On documented dynamically linked builds (DYNAMIC=1 / no static-link flags), which the vendor requires for custom Go plugins, plugin.Open is expected to succeed and this is unauthenticated remote code execution. On the published statically linked Docker image, plugin.Open fails with Dynamic loading not supported, so that build class is only server-side request forgery. Attack complexity is High because the attacker cannot force RCE on the default static image and a loadable plugin must match the host Go version, OS, architecture, and linkage. The 1.6.x HTTP transport line through 1.6.11 does not contain the fix."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eA proof of concept issues an unauthenticated POST /api/plugins with enabled=true and path set to an HTTP URL of a Go shared object built for the target Go version and linkage. On a dynamically linked Bifrost binary the loader downloads the body and plugin.Open runs Init in-process (for example writing a marker file as the gateway user). On the official static image the same request downloads the file and then fails with Dynamic loading not supported.\u003c/p\u003e"
            }
          ],
          "value": "A proof of concept issues an unauthenticated POST /api/plugins with enabled=true and path set to an HTTP URL of a Go shared object built for the target Go version and linkage. On a dynamically linked Bifrost binary the loader downloads the body and plugin.Open runs Init in-process (for example writing a marker file as the gateway user). On the official static image the same request downloads the file and then fails with Dynamic loading not supported."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-253",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-253 Remote Code Inclusion"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
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            "scope": "UNCHANGED",
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            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "value": "GENERAL"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "CWE-94: Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
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        {
          "descriptions": [
            {
              "cweId": "CWE-306",
              "description": "CWE-306: Missing Authentication for Critical Function",
              "lang": "en",
              "type": "CWE"
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        {
          "descriptions": [
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              "cweId": "CWE-284",
              "description": "CWE-284: Improper Access Control",
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              "type": "CWE"
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        "dateUpdated": "2026-09-06T11:20:11.759Z",
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      "references": [
        {
          "name": "GHSA-2qp8-4xgm-fw6g",
          "tags": [
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          ],
          "url": "https://github.com/maximhq/bifrost/security/advisories/GHSA-2qp8-4xgm-fw6g"
        },
        {
          "name": "PR #5763: require authenticated admin for custom plugin path; harden plugin download SSRF",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/maximhq/bifrost/pull/5763"
        },
        {
          "name": "Merge commit for PR #5763",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/maximhq/bifrost/commit/e0057ff355f831c251eabe9d0e44f3a3748532c6"
        },
        {
          "name": "Bifrost HTTP v2.0.0 (first stable release containing the fix)",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/maximhq/bifrost/releases/tag/transports/v2.0.0"
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        {
          "name": "Bifrost repository",
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          "url": "https://github.com/maximhq/bifrost"
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          "lang": "en",
          "supportingMedia": [
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              "value": "\u003cp\u003eUpgrade Bifrost HTTP transport to 2.0.0 or later. The fix (PR #5763) refuses create and update of a non-builtin plugin path when the request was let through because dashboard authentication is disabled or unconfigured (403), and replaces the plugin downloader with an SSRF-hardened client. The 1.6.x line through 1.6.11 does not include this change.\u003c/p\u003e"
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          "value": "Upgrade Bifrost HTTP transport to 2.0.0 or later. The fix (PR #5763) refuses create and update of a non-builtin plugin path when the request was let through because dashboard authentication is disabled or unconfigured (403), and replaces the plugin downloader with an SSRF-hardened client. The 1.6.x line through 1.6.11 does not include this change."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
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      "timeline": [
        {
          "lang": "en",
          "time": "2026-07-19T10:02:00.000Z",
          "value": "Reported to the Bifrost maintainers (GHSA-2qp8-4xgm-fw6g)"
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          "lang": "en",
          "time": "2026-08-03T04:50:00.000Z",
          "value": "Fix merged upstream (PR #5763)"
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        {
          "lang": "en",
          "time": "2026-08-13T18:51:00.000Z",
          "value": "Fix first present on the v2 line in transports/v2.0.0-prerelease3"
        },
        {
          "lang": "en",
          "time": "2026-08-26T19:47:00.000Z",
          "value": "Fix first shipped in a stable release (Bifrost HTTP v2.0.0)"
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      ],
      "title": "Unauthenticated RCE via Custom Plugin HTTP Path on Dynamically Linked Builds",
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          "lang": "en",
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              "value": "\u003cp\u003eIf custom Go plugins are not required, run the statically linked binary or official Docker image so plugin.Open cannot succeed. Otherwise enable dashboard authentication and keep the management listener off untrusted networks.\u003c/p\u003e"
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          "value": "If custom Go plugins are not required, run the statically linked binary or official Docker image so plugin.Open cannot succeed. Otherwise enable dashboard authentication and keep the management listener off untrusted networks."
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{
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    "adp": [
      {
        "metrics": [
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              "content": {
                "id": "CVE-2026-55245",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-28T19:54:05.268770Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-08-28T19:54:10.966Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "references": [
          {
            "tags": [
              "exploit"
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            "url": "https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "bifrost",
          "vendor": "maximhq",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.5.17"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Bifrost is an enterprise AI gateway for routing requests to model providers. Prior to 1.5.17, the isPublicIP function in core/providers/utils/fetch.go, reached through FetchAndEncodeURL for Bedrock and Vertex image or document URLs, classifies Carrier-Grade NAT 100.64.0.0/10, IPv6 6to4 2002::/16, NAT64 64:ff9b::/96 and 64:ff9b:1::/48, and deprecated IPv6 site-local fec0::/10 addresses as public. A remote attacker who controls a multimodal request URL can make the gateway fetch internal services, including a cloud instance metadata endpoint encoded through 6to4 or NAT64. This issue is fixed in version 1.5.17."
        }
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          "value": "Fix merged upstream (PR #5763)"
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          "time": "2026-08-26T19:47:00.000Z",
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