CISA ADP Vulnrichment

Answer in brief

CVE-2026-21580 records a Critical severity (CVSS 9.3) vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps Atlassian/Confluence Data Center (generic), Atlassian/Confluence Server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 18, 2026Updated Aug 20, 2026Source checked Aug 20, 2026First seen by HOL Aug 18, 2026Material review Aug 20, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Atlassian/Confluence Data Center (generic), Atlassian/Confluence Server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Atlassian/Confluence Data Centergeneric	10.2.0 to 10.2.11 \|\| 10.1.0 to 10.1.2 \|\| 10.0.2 to 10.0.3 \|\| 9.5.1 to 9.5.4 \|\| 9.4.0 to 9.4.1 \|\| 9.3.1 to 9.3.2 \|\| 9.2.0 to 9.2.20 \|\| 9.1.0 to 9.1.1 \|\| 9.0.3 \|\| 8.9.6 to 8.9.8 \|\| 8.5.15 to 8.5.31 \|\| 7.19.27 to 7.19.30	Not reported
Atlassian/Confluence Servergeneric	8.5.15 to 8.5.31 \|\| 7.19.27 to 7.19.30	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Atlassian/Confluence Data Center, Atlassian/Confluence Server.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 18, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.