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CVE-2022-26134

Exploitation: active CVSS 9.8 CRITICAL Ransomware: known use

CVSS base score: 9.8 (Critical) CISA · v3.1

Score assigned by CISA's Vulnrichment program; the vendor's CVE record did not include one.

Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability

Vendor: Atlassian   Product: Confluence Server/Data Center

Description

Atlassian Confluence Server and Data Center contain a remote code execution vulnerability that allows for an unauthenticated attacker to perform remote code execution.

Lifecycle Timeline

Each milestone comes from a different source, so gaps between them are gaps in what those sources publish, not evidence that nothing happened. EPSS history for this CVE holds 237 points from 2022-06-04, tracked daily from 2026-09-09; earlier points are weekly, which dates a spike to within a week. Peak probability 100.0% on 2026-06-20.

Published Applicability

CVE List v5 (CNA container) 28 affected · 0 fixed · 0 not affected

Check whether a specific version is affected →

What each source publishes about which product versions carry this vulnerability, kept as written rather than merged. Absence here means no source has published applicability data, not that nothing is affected.

Research & News Coverage

No mentions found in monitored research blogs or news feeds.

Detection & Exploitation

Scan
Network IDS/IPS
Host / SIEM

Coverage across public collections only: Nuclei and OpenVAS NVT (scan); Snort and Suricata ET Open (network); Sigma and YARA (host/SIEM); Metasploit, Exploit-DB and public GitHub repositories (exploit). Absence here means nothing public was found, not that detection is impossible.
GitHub PoC repositories are collected automatically by PoC-in-GitHub (CC0) and are not vetted: some are fakes and some are malware. Treat them as evidence that code was published, not as code to run.
OpenVAS coverage derives from the Greenbone Community Feed, made available under the Open Database License (ODbL) v1.0; its individual Vulnerability Tests are licensed GNU GPL v2.

CISA Assessment (Vulnrichment / SSVC)

active
yes
total
9.8 CRITICAL
—
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-917 — Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
2025-02-04

D3FEND Countermeasures

Defensive techniques inferred by MITRE D3FEND from the underlying weakness (CWE-917) — general hardening and detection guidance for this weakness class, not a vendor patch for this specific CVE.

KEV Catalog Status

2022-06-02
2022-06-06
Known

Listed By

SourceDateRecord
CISA KEV 2022-06-02 source record →
CISA Vulnrichment 2025-02-04 source record →

Referenced in Advisories

DateAdvisoryIssuer
2024-11-12 2023 Top Routinely Exploited Vulnerabilities CISA
2024-09-18 People's Republic of China-Linked Actors Compromise Routers and IoT Devices for Botnet Operations FBI
2024-09-05 Russian Military Cyber Actors Target US and Global Critical Infrastructure NSA
2024-09-05 Russian Military Cyber Actors Target U.S. and Global Critical Infrastructure NSA

Weaponization Timeline — Offensive & Testing Tools

DateToolEvidence qualityReference
2022-06-11 AtomicRedTeam Indirect — framework reference PR: Python pty module and spawn function used to spawn sh or bash

Evidence tiers are explained on the About page — a merged Metasploit module is far stronger evidence than a distro package mention.

External References