CVE-2026-21580 (GCVE-0-2026-21580)
Vulnerability from cvelistv5
Published
2026-08-18 22:00
Modified
2026-08-21 14:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Stored XSS
Summary
This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was introduced in versions 7.1.1, 7.4.0, 7.13.0, 7.17.0, 7.19.0, 8.0.0, 8.5.0, 8.9.0, 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 and Server.
This Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability, with a CVSS Score of 8.6, allows an unauthenticated attacker to execute arbitrary HTML or JavaScript code on a victims browser, perform actions as a higher-privileged user, and to get into the system utilizing loopholes exposed from security best-practices being overlooked.
Atlassian recommends that Confluence Data Center and Server 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 and Server 9.2: Upgrade to a release greater than or equal to 9.2.21
Confluence Data Center and Server 10.2: Upgrade to a release greater than or equal to 10.2.13
See the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center and Server from the download center ([https://www.atlassian.com/software/confluence/download-archives]).
This vulnerability was reported via our Bug Bounty program.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Atlassian | Confluence Data Center |
Version: 10.2.0 to 10.2.11 Version: 10.1.0 to 10.1.2 Version: 10.0.2 to 10.0.3 Version: 9.5.1 to 9.5.4 Version: 9.4.0 to 9.4.1 Version: 9.3.1 to 9.3.2 Version: 9.2.0 to 9.2.20 Version: 9.1.0 to 9.1.1 Version: 9.0.3 Version: 8.9.6 to 8.9.8 Version: 8.5.15 to 8.5.31 Version: 7.19.27 to 7.19.30 |
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|
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\"atlassian\", \"dateUpdated\": \"2026-08-18T22:00:00.396Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-21580\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-20T15:36:48.127Z\", \"dateReserved\": \"2026-01-01T00:00:40.721Z\", \"assignerOrgId\": \"f08a6ab8-ed46-4c22-8884-d911ccfe3c66\", \"datePublished\": \"2026-08-18T22:00:00.396Z\", \"assignerShortName\": \"atlassian\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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