CVE-2024-21686

Severity: high (CVSS 8.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-16 · updated 2026-06-17
Weakness: CWE-79

Description

This High severity Stored XSS vulnerability was introduced in versions 7.13 of Confluence Data Center and Server. This Stored XSS vulnerability, with a CVSS Score of 7.3, allows an authenticated attacker to execute arbitrary HTML or JavaScript code on a victims browser which has high impact to confidentiality, high impact to integrity, no impact to availability, and requires user interaction. 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 listed on this CVE 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.

Affected products

Atlassian Confluence Data Center: before 7.19.22; from 7.20.0 before 8.5.9; from 8.6.0 before 8.9.1 — fixed in 7.19.22, 8.5.9, 8.9.1
Atlassian Confluence Data Center: before 7.19.22; from 7.20.0 before 8.5.9 — fixed in 7.19.22, 8.5.9

How to fix

Upgrade to a fixed version: Atlassian Confluence Data Center 7.19.22, 8.5.9, 8.9.1; Atlassian Confluence Data Center 7.19.22, 8.5.9. Check the vendor advisory for mitigations.

References

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