CVE-2022-26134 CISA KEV — actively exploited Ransomware-linked

Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability

Atlassian — Confluence Data Center

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are from 1.3.0 before 7.4.17, from 7.13.0 before 7.13.7, from 7.14.0 before 7.14.3, from 7.15.0 before 7.15.2, from 7.16.0 before 7.16.4, from 7.17.0 before 7.17.4, and from 7.18.0 before 7.18.1.

CVSS scoreCritical

9.8

EPSS — exploitation probabilityCritical

100.0%

Vector breakdown

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published: Jun 3, 2022
Modified: Jun 17, 2026
Added to KEV: Jun 2, 2022
Federal patch due: Jun 6, 2022

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 successfully deployed, agencies can reassess the internet blocking rules.

Weakness classification

CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement

Affected packages

unknown packageunknown

GHSA-653m-wpjp-54c4

Proof-of-concept & exploitation references

8 found

Weaponization

Nuclei template

Available

Metasploit module

Not found

Public repositories whose name or description references CVE-2022-26134, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.

References

Frequently asked questions

What is CVE-2022-26134?

How severe is CVE-2022-26134?

CVE-2022-26134 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).

Is CVE-2022-26134 actively exploited in the wild?

Yes. CVE-2022-26134 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jun 2, 2022, meaning CISA has confirmed evidence of active exploitation. It is also flagged as used in ransomware campaigns.

What is the EPSS score for CVE-2022-26134?

100.0% - meaning FIRST.org's EPSS model estimates a 100.0% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).

Is there exploit tooling available for CVE-2022-26134?

Yes - a public Nuclei template referencing CVE-2022-26134 exist in public repositories we checked. We also found 8 public GitHub repositories referencing this CVE.

What type of vulnerability is CVE-2022-26134?

CVE-2022-26134 is classified under CWE-917 (CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')).

Cross-checked against

Impactr finds and proves whether CVE-2022-26134 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.

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