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

Vulnerability from cvelistv5 – Published: 2026-07-21 17:00 – Updated: 2026-07-22 18:48
VLAI
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 18:32 UTC
CWE
  • DoS (Denial of Service)
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version CPE status
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
    cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.2.5:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.2.6:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.2.7:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:9.2.8:*:*:*:*:*:*:*
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    cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
    cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-21577\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-22T18:32:38.139315Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-22T18:32:50.393Z\"}}], \"cna\": {\"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"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\"}}], \"affected\": [{\"vendor\": \"Atlassian\", \"product\": \"Confluence Data Center\", \"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\"}]}], \"references\": [{\"url\": \"https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999345\"}, {\"url\": \"https://jira.atlassian.com/browse/CONFSERVER-104334\"}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"DoS (Denial of Service)\", \"description\": \"DoS (Denial of Service)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.4.1\", \"versionStartIncluding\": \"9.4.0\"}, {\"criteria\": \"cpe:2.3:a:atlassian:confluence_data_center:9.4.1:*:*:*:*:*:*:*\", \"vulnerable\": true}, {\"criteria\": \"cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.3.2\", \"versionStartIncluding\": \"9.3.1\"}, {\"criteria\": \"cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.2.15\", \"versionStartIncluding\": \"9.2.0\"}, {\"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:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.1.1\", \"versionStartIncluding\": \"9.1.0\"}, {\"criteria\": \"cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.0.3\", \"versionStartIncluding\": \"9.0.1\"}, {\"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}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f08a6ab8-ed46-4c22-8884-d911ccfe3c66\", \"shortName\": \"atlassian\", \"dateUpdated\": \"2026-07-21T17:00:00.483Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21577\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-22T18:48:52.568Z\", \"dateReserved\": \"2026-01-01T00:00:40.721Z\", \"assignerOrgId\": \"f08a6ab8-ed46-4c22-8884-d911ccfe3c66\", \"datePublished\": \"2026-07-21T17:00:00.483Z\", \"assignerShortName\": \"atlassian\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.