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FKIE_CVE-2021-26085

Vulnerability from fkie_nvd - Published: 2021-08-03 00:15 - Updated: 2026-06-17 03:42
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Summary
Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.
References
security@atlassian.comhttp://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.htmlExploit, Third Party Advisory, VDB Entry
security@atlassian.comhttps://jira.atlassian.com/browse/CONFSERVER-67893Issue Tracking, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108https://jira.atlassian.com/browse/CONFSERVER-67893Issue Tracking, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26085US Government Resource
Impacted products
Vendor Product Version
atlassian confluence_data_center *
atlassian confluence_data_center *
atlassian confluence_server *
atlassian confluence_server *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Confluence Server",
          "vendor": "Atlassian",
          "versions": [
            {
              "lessThan": "7.4.10",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            },
            {
              "lessThan": "unspecified",
              "status": "affected",
              "version": "7.5.0",
              "versionType": "custom"
            },
            {
              "lessThan": "7.12.3",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Confluence Data Center",
          "vendor": "Atlassian",
          "versions": [
            {
              "lessThan": "7.4.10",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            },
            {
              "lessThan": "unspecified",
              "status": "affected",
              "version": "7.5.0",
              "versionType": "custom"
            },
            {
              "lessThan": "7.12.3",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@atlassian.com"
    }
  ],
  "cisaActionDue": "2022-04-18",
  "cisaExploitAdd": "2022-03-28",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "83557716-7A48-48D5-85A9-4A29DBF4F511",
              "versionEndExcluding": "7.4.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6A310D77-1FFF-4FFE-AD50-75DFF973EB3F",
              "versionEndExcluding": "7.12.3",
              "versionStartIncluding": "7.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4BA04112-3B97-491B-93E6-80C444274430",
              "versionEndExcluding": "7.4.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:atlassian:confluence_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B1148DF0-42C0-435F-A6EB-EFA93E10E8D7",
              "versionEndExcluding": "7.12.3",
              "versionStartIncluding": "7.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3."
    },
    {
      "lang": "es",
      "value": "Las versiones afectadas de Atlassian Confluence Server permiten a los atacantes remotos visualizar recursos restringidos por medio de una vulnerabilidad de lectura arbitraria de archivos de autorizaci\u00f3n previa en el endpoint /s/.\u0026#xa0;Las versiones afectadas son anteriores a la versi\u00f3n 7.4.10 y desde la versi\u00f3n 7.5.0 anteriores a 7.12.3"
    }
  ],
  "id": "CVE-2021-26085",
  "lastModified": "2026-06-17T03:42:49.933",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-26085",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-02-07T12:29:39.323995Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-08-03T00:15:08.557",
  "references": [
    {
      "source": "security@atlassian.com",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.html"
    },
    {
      "source": "security@atlassian.com",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "https://jira.atlassian.com/browse/CONFSERVER-67893"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "https://jira.atlassian.com/browse/CONFSERVER-67893"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26085"
    }
  ],
  "sourceIdentifier": "security@atlassian.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-425"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-425"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}



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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

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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.
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  • 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.


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