CVE-2026-21579: This High severity Information Disclosure vulnerability was introduced in versions 7.17.0, 7.19.0, 8.5.0, 8.9.

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-21579 is a high-severity flaw (CVSS 7.5) affecting confluence data center. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

This High severity Information Disclosure vulnerability was introduced in versions 7.17.0, 7.19.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center. This Information Disclosure vulnerability, with a CVSS Score of 8.2, allows an unauthenticated attacker to view sensitive information via an Information Disclosure vulnerability. Atlassian recommends that Confluence Data Center customers upgrade to latest

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): Atlassian · Vendor: atlassian

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 18:16 UTCPublished CVE record published
2026-10-24 19:10 UTCUpdated Record last modified

atlassian confluence data center UPGRADE

Affected: >= 7.19.26 and <= 7.19.30 · >= 8.5.14 and <= 8.5.31 · >= 8.9.5 and <= 8.9.8 · >= 9.0.1 and <= 9.0.3 · >= 9.1.0 and <= 9.1.1 · >= 9.2.0 and <= 9.2.21 · >= 10.0.2 and <= 10.0.3 · >= 10.1.0 and <= 10.1.2

Fixed in: newer than 10.2.13

Safe to downgrade to: a release before 7.19.26

1. Check installed version

apt-cache policy confluence-data-center || rpm -q confluence-data-center || confluence-data-center --version

2. UPGRADE to newer than 10.2.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade confluence-data-center

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade confluence-data-center

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.19.26 (Debian / Ubuntu)

apt-cache madison confluence-data-center sudo apt install confluence-data-center=<VERSION_BEFORE_7.19.26> sudo apt-mark hold confluence-data-center

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list confluence-data-center sudo dnf downgrade confluence-data-center-<VERSION_BEFORE_7.19.26> sudo dnf versionlock add confluence-data-center

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21579?

confluence data center: upgrade to newer than 10.2.13. Exact commands for each OS are on this page.

Is CVE-2026-21579 being exploited?

CVE-2026-21579 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21579 affect?

CVE-2026-21579 affects confluence data center. Severity is high (CVSS 7.5). This High severity Information Disclosure vulnerability was introduced in versions 7.17.0, 7.19.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center. This Information Disclosure vulnerability, with a

How urgent is CVE-2026-21579?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Software pages

Atlassian Confluence vulnerabilities

Related CVEs

CVE-2026-21577 MEDIUM 6.5 UPGRADE This High severity DoS (Denial of Service) vulnerability was introduced in versions 9.0.1, 9.1.0, 9.2.0, 9.3.1
CVE-2026-21589 HIGH 7.5 EXPLOITED UPGRADE UPGRADE Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability

References

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