CVE-2026-77711 (GCVE-0-2026-77711)
Vulnerability from cvelistv5
Published
2026-10-15 08:51
Modified
2026-10-15 13:50
Severity ?
8.2 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
Summary
When Jetty's `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required). The client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the `Proxy-Authentication` header, which arrives to the server, that now has access to the proxy credentials.
References
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse Jetty Version: 12.1.0   ≤ 12.1.12
Version: 12.0.0   ≤ 12.0.38
Version: 11.0.0   ≤ 11.0.32
Version: 10.0.0   ≤ 10.0.32
Version: 9.4.0   ≤ 9.4.64
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-77711",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T13:50:25.620133Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T13:50:52.566Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageName": "org.eclipse.jetty:jetty-client",
          "product": "Eclipse Jetty",
          "vendor": "Eclipse Foundation",
          "versions": [
            {
              "lessThanOrEqual": "12.1.12",
              "status": "affected",
              "version": "12.1.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "12.0.38",
              "status": "affected",
              "version": "12.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "11.0.32",
              "status": "affected",
              "version": "11.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "10.0.32",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.4.64",
              "status": "affected",
              "version": "9.4.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "https://github.com/4ra1n"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "https://github.com/pyn3rd"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "https://github.com/unam4"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eWhen Jetty\u0027s `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).\u003c/p\u003e\u003cp\u003eThe client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the `Proxy-Authentication` header, which arrives to the server, that now has access to the proxy credentials.\u003c/p\u003e"
            }
          ],
          "value": "When Jetty\u0027s `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).\n\n\n\nThe client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the `Proxy-Authentication` header, which arrives to the server, that now has access to the proxy credentials."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "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:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-15T08:51:48.066Z",
        "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
        "shortName": "eclipse"
      },
      "references": [
        {
          "url": "https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw"
        },
        {
          "url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
    "assignerShortName": "eclipse",
    "cveId": "CVE-2026-77711",
    "datePublished": "2026-10-15T08:51:48.066Z",
    "dateReserved": "2026-08-21T08:58:54.421Z",
    "dateUpdated": "2026-10-15T13:50:52.566Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-77711\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-15T13:50:25.620133Z\"}}}], \"references\": [{\"url\": \"https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-15T13:50:46.699Z\"}}], \"cna\": {\"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"https://github.com/4ra1n\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"https://github.com/pyn3rd\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"https://github.com/unam4\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.2, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Eclipse Foundation\", \"product\": \"Eclipse Jetty\", \"versions\": [{\"status\": \"affected\", \"version\": \"12.1.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"12.1.12\"}, {\"status\": \"affected\", \"version\": \"12.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"12.0.38\"}, {\"status\": \"affected\", \"version\": \"11.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"11.0.32\"}, {\"status\": \"affected\", \"version\": \"10.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"10.0.32\"}, {\"status\": \"affected\", \"version\": \"9.4.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"9.4.64\"}], \"packageName\": \"org.eclipse.jetty:jetty-client\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://github.com/jetty/jetty.project/security/advisories/GHSA-r2c5-3p8g-wpvw\"}, {\"url\": \"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/238\"}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.5\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"When Jetty\u0027s `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).\\n\\n\\n\\nThe client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the `Proxy-Authentication` header, which arrives to the server, that now has access to the proxy credentials.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eWhen Jetty\u0027s `HttpClient` make a request to a server through a forward proxy, the server may reply with a 407 (Proxy Authentication Required).\u003c/p\u003e\u003cp\u003eThe client mistakenly interprets the 407 as coming from the proxy, so it re-sends the request with the `Proxy-Authentication` header, which arrives to the server, that now has access to the proxy credentials.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-200\", \"description\": \"CWE-200\"}]}], \"providerMetadata\": {\"orgId\": \"e51fbebd-6053-4e49-959f-1b94eeb69a2c\", \"shortName\": \"eclipse\", \"dateUpdated\": \"2026-10-15T08:51:48.066Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-77711\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T13:50:52.566Z\", \"dateReserved\": \"2026-08-21T08:58:54.421Z\", \"assignerOrgId\": \"e51fbebd-6053-4e49-959f-1b94eeb69a2c\", \"datePublished\": \"2026-10-15T08:51:48.066Z\", \"assignerShortName\": \"eclipse\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.