Vulnerability-Lookup

GHSA-2V44-87C2-PXR3

Vulnerability from github – Published: 2026-07-21 18:31 – Updated: 2026-07-21 18:31

Details

This High severity DoS (Denial of Service) vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0 and 10.2.0 of Confluence Data Center.

This DoS (Denial of Service) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network.

Atlassian recommends that Confluence Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.17

Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.7

See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]).

This vulnerability was reported via our Penetration Testing program.

Severity

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-21577"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-21T18:16:57Z",
    "severity": "HIGH"
  },
  "details": "This High severity DoS (Denial of Service) vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0 and 10.2.0 of Confluence Data Center.\n\nThis DoS (Denial of Service) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network.\n\nAtlassian recommends that Confluence Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:\n Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.17\n\n Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.7\n\nSee the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]).\n\nThis vulnerability was reported via our Penetration Testing program.",
  "id": "GHSA-2v44-87c2-pxr3",
  "modified": "2026-07-21T18:31:03Z",
  "published": "2026-07-21T18:31:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21577"
    },
    {
      "type": "WEB",
      "url": "https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999345"
    },
    {
      "type": "WEB",
      "url": "https://jira.atlassian.com/browse/CONFSERVER-104334"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-21577 (GCVE-0-2026-21577)

Vulnerability from cvelistv5 – Published: 2026-07-21 17:00 – Updated: 2026-07-22 18:48

Summary

This High severity DoS (Denial of Service) vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0 and 10.2.0 of Confluence Data Center. This DoS (Denial of Service) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network. Atlassian recommends that Confluence Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions: Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.17 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.7 See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]). This vulnerability was reported via our Penetration Testing program.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

DoS (Denial of Service)
CWE-400 - Uncontrolled Resource Consumption

Assigner

atlassian

References

2 references

URL	Tags
https://confluence.atlassian.com/pages/viewpage.a…
https://jira.atlassian.com/browse/CONFSERVER-104334

Impacted products

1 product

Vendor	Product	Version
Atlassian	Confluence Data Center	Affected: 10.2.0 to 10.2.6 Affected: 10.1.0 to 10.1.2 Affected: 10.0.2 to 10.0.3 Affected: 9.5.1 to 9.5.4 Affected: 9.4.0 to 9.4.1 Affected: 9.3.1 to 9.3.2 Affected: 9.2.0 to 9.2.15 Affected: 9.1.0 to 9.1.1 Affected: 9.0.1 to 9.0.3 Unaffected: 10.2.7 to 10.2.14 Unaffected: 9.2.17 to 9.2.22

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21577",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-22T18:32:38.139315Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-400",
                "description": "CWE-400 Uncontrolled Resource Consumption",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-22T18:48:52.568Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Confluence Data Center",
          "vendor": "Atlassian",
          "versions": [
            {
              "status": "affected",
              "version": "10.2.0 to 10.2.6"
            },
            {
              "status": "affected",
              "version": "10.1.0 to 10.1.2"
            },
            {
              "status": "affected",
              "version": "10.0.2 to 10.0.3"
            },
            {
              "status": "affected",
              "version": "9.5.1 to 9.5.4"
            },
            {
              "status": "affected",
              "version": "9.4.0 to 9.4.1"
            },
            {
              "status": "affected",
              "version": "9.3.1 to 9.3.2"
            },
            {
              "status": "affected",
              "version": "9.2.0 to 9.2.15"
            },
            {
              "status": "affected",
              "version": "9.1.0 to 9.1.1"
            },
            {
              "status": "affected",
              "version": "9.0.1 to 9.0.3"
            },
            {
              "status": "unaffected",
              "version": "10.2.7 to 10.2.14"
            },
            {
              "status": "unaffected",
              "version": "9.2.17 to 9.2.22"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.4.1",
                  "versionStartIncluding": "9.4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.4.1:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.3.2",
                  "versionStartIncluding": "9.3.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.2.15",
                  "versionStartIncluding": "9.2.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.2:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.3:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.4:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.5:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.6:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.7:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.8:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.9:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.10:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.11:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.12:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.13:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.14:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.15:*:*:*:*:*:*:*",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.1.1",
                  "versionStartIncluding": "9.1.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.0.3",
                  "versionStartIncluding": "9.0.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.17:*:*:*:*:*:*:*",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.18:*:*:*:*:*:*:*",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.19:*:*:*:*:*:*:*",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.20:*:*:*:*:*:*:*",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.21:*:*:*:*:*:*:*",
                  "vulnerable": false
                },
                {
                  "criteria": "cpe:2.3:a:atlassian:confluence_data_center:9.2.22:*:*:*:*:*:*:*",
                  "vulnerable": false
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "This High severity DoS (Denial of Service) vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0 and 10.2.0 of Confluence Data Center.\r\n\r\nThis DoS (Denial of Service) vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to cause a resource to be unavailable for its intended users by temporarily or indefinitely disrupting services of a host connected to a network.\r\n\r\nAtlassian recommends that Confluence Data Center customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:\r\n Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.17\r\n\r\n Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.7\r\n\r\nSee the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]).\r\n\r\nThis vulnerability was reported via our Penetration Testing program."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "DoS (Denial of Service)",
              "lang": "en",
              "type": "DoS (Denial of Service)"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-21T17:00:00.483Z",
        "orgId": "f08a6ab8-ed46-4c22-8884-d911ccfe3c66",
        "shortName": "atlassian"
      },
      "references": [
        {
          "url": "https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999345"
        },
        {
          "url": "https://jira.atlassian.com/browse/CONFSERVER-104334"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f08a6ab8-ed46-4c22-8884-d911ccfe3c66",
    "assignerShortName": "atlassian",
    "cveId": "CVE-2026-21577",
    "datePublished": "2026-07-21T17:00:00.483Z",
    "dateReserved": "2026-01-01T00:00:40.721Z",
    "dateUpdated": "2026-07-22T18:48:52.568Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-2V44-87C2-PXR3

CVE-2026-21577 (GCVE-0-2026-21577)

Tags

Sightings

Nomenclature