8.2

CVE-2026-21579: atlassian confluence_data_center

Analyzed
Published 21-07-2026Last modified 22-07-2026

Vulnerability summary

CVE-2026-21579 is a high (CVSS 8.2) vulnerability in atlassian confluence_data_center. EPSS estimates a 0.44% chance of exploitation in the next 30 days, higher than 38.2% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.2 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.44%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 21-07-2026
    PublishedVulnerability first disclosed.
  2. 22-07-2026
    Last modifiedVulnerability information updated.

Description

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 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 9.2.22 Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.14 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 Atlassian (Internal) program.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.44%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.44% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Atlassian1 product
  • confluence_data_center10.2.0 to 10.2.13 | 10.1.0 to 10.1.2 | 10.0.2 to 10.0.3 | 9.2.0 to 9.2.21 | 9.1.0 to 9.1.1 | 9.0.1 to 9.0.3 | 8.9.5 to 8.9.8 | 8.5.14 to 8.5.31 | 7.19.26 to 7.19.30 | ≥ 7.19.26, ≤ 7.19.30 | ≥ 8.5.14, ≤ 8.5.31 | ≥ 8.9.5, ≤ 8.9.8 | ≥ 9.0.1, ≤ 9.0.3 | ≥ 9.1.0, ≤ 9.1.1 | ≥ 9.2.0, ≤ 9.2.21 | ≥ 10.0.2, ≤ 10.0.3 | ≥ 10.1.0, ≤ 10.1.2 | ≥ 10.2.0, ≤ 10.2.13

1 vendor · 1 product

References

2 links