Exploited CVEs / Atlassian / CVE-2022-26134

CVE-2022-26134

Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2022-06-06 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Atlassian Security Advisories, linked below.

Risk summary

CriticalCISA KEVRansomware

9.8

CVSS v3 base

100%

EPSS exploit probability

Critical

Severity

2022-06-02

Added to KEV

2022-06-06 (past due)

CISA due date

Actively exploited Atlassian Confluence Server/Data Center vulnerability, Critical severity, CVSS v3 9.8. Added to the CISA KEV catalog 2022-06-02.

Senserva AI read on CVE-2022-26134 CISA required action Official fix for CVE-2022-26134 Admin questions #55 hottest CVE right now

Senserva AI Opinion for CVE-2022-26134

This is an OGNL injection flaw in Confluence Server and Data Center that lets an unauthenticated attacker run code directly on the server, no login or user interaction needed. Any internet-facing Confluence instance is a prime target: EPSS puts exploit probability at 100 percent, it is in CISA KEV since June 2022, and it has been folded into ransomware campaigns. Attackers often planted web shells before patching, so a simple update may not clear an existing compromise.

Do this: Patch every Confluence Server and Data Center instance to a fixed version now, then hunt for web shells and unexpected child processes rather than assuming the update alone is sufficient.

AI-generated from public data, 2026-07-23. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2022-26134

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I run IT security. Facts for CVE-2022-26134, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2022-26134.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2022-26134: Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability
- Affected: Atlassian Confluence Server/Data Center
- Severity: Critical, CVSS v3 9.8; EPSS 30-day exploitation probability 100%
- Added to CISA KEV: 2022-06-02; federal remediation due 2022-06-06
- Ransomware-linked: YES
- CISA required action: Immediately block all internet traffic to and from affected products AND apply the update per vendor instructions [https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html] OR remove the affected products by the due date on the right. Note: Once the update is s...
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) The fastest safe path to remediation. 4) How to check whether my environment is exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch immediately

Exploited in the wild and used in ransomware campaigns.

The fix ships from the vendor: Atlassian Security Advisories.

Do this now: Move this ahead of everything else in the queue, then verify the fix actually landed on every exposed device.

Updated August 29, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2022-26134

Published: 2022-06-02
Last revised: 2022-06-02
Changes tracked: 1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

Senserva Watchevery change we have recorded for this one

What changed, and when

2022-06-02 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 9.8; EPSS first scored at 100.0%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

CISA required action

Federal (BOD 22-01) remediation due date: 2022-06-06 (past due).

Immediately block all internet traffic to and from affected products AND apply the update per vendor instructions [https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html] OR remove the affected products by the due date on the right. Note: Once the update is successfully deployed, agencies can reassess the internet blocking rules.

Official fix for CVE-2022-26134

The authoritative fix and affected-version list are published by the vendor. Find the Confluence Server/Data Center advisory on Atlassian Security Advisories.

Atlassian Security Advisories CISA KEV entry

Common questions about CVE-2022-26134

Is CVE-2022-26134 actively exploited?

Yes. CVE-2022-26134 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-06-02, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 100%. CISA also reports it is known to be used in ransomware campaigns.

What is the CISA deadline and required action for CVE-2022-26134?

CISA set the federal (BOD 22-01) remediation due date at 2022-06-06, which has passed; treat any unremediated system as overdue. The verbatim required action: Immediately block all internet traffic to and from affected products AND apply the update per vendor instructions [https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html] OR remove the affected products by the due date on the right. Note: Once the update is successfully deployed, agencies can reassess the internet blocking rules.

What fixes CVE-2022-26134?

The authoritative fix is in the vendor advisory: see Atlassian Security Advisories for the patched Confluence Server/Data Center versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2022-26134?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2022-26134's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).

Scope and sources

More exploited Atlassian CVEs: CVE-2021-26086 CVE-2023-22527 CVE-2023-22518 CVE-2023-22515 CVE-2022-36804 CVE-2022-26138 CVE-2021-26085 CVE-2019-11581
All Atlassian exploited CVEs on one page: Atlassian vulnerabilities actively exploited.
Authoritative references: CVE record NVD detail CISA KEV catalog FIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.