Threat Signal Report

Active Exploitation of Confluence vulnerability (CVE-2022-26134)

description-logo Description

FortiGuard Labs is aware that an unauthenticated remote code execution vulnerability in Confluence (CVE-2022-26134) continues to be exploited to deploy malware in the field. Deployed malware reportedly includes Cerber2021 ransomware, Hezb, coinminers and Dark.IoT. The vulnerability was patched on June 3rd, 2022.

Why is this Significant?

This is significant because CVE-2022-26134 is a newly patched Confluence vulnerability that continues to be exploited in the field and various malware were deployed to the affected systems upon successful exploitation.

What is CVE-2022-26134?

CVE-2022-26134 is a critical vulnerability affects Confluence Server and Data Center which the latest patch has not yet been applied. The vulnerability relates to an Object-Graph Navigation Language (OGNL) injection that could allow an unauthenticated user to execute arbitrary code on the compromised system.

Atlassian released a fix on June 3rd, 2022.

FortiGuard Labs previously published a Threat Signal on the subject. See the Appendix for a link to "New Confluence Vulnerability (CVE-2022-26134) Exploited in the Wild".

What Malware were Deployed to the Compromised Servers?

Malware such as Cerber2021 ransomware, Dark.IoT and coinminers such as Kinsing and XMRig miner are known to be deployed to the affected servers.

What is the Status of Coverage?

FortiGuard Labs detects the malicious samples that were known to be deployed through CVE-2022-21634 with the following AV signatures:








FortiGuard Labs released the following IPS signature against CVE-2022-26134 in version 21.331:


Initially, the signature's default action was set to "pass", however the action was changed to "drop" from version 21.333.



Traffic Light Protocol

Color When Should it Be used? How may it be shared?


Not for disclosure, restricted to participants only.
Sources may use TLP:RED when information cannot be effectively acted upon by additional parties, and could lead to impacts on a party's privacy, reputation, or operations if misused. Recipients may not share TLP:RED information with any parties outside of the specific exchange, meeting, or conversation in which it was originally disclosed. In the context of a meeting, for example, TLP:RED information is limited to those present at the meeting. In most circumstances, TLP:RED should be exchanged verbally or in person.


Limited disclosure, restricted to participants’ organizations.
Sources may use TLP:AMBER when information requires support to be effectively acted upon, yet carries risks to privacy, reputation, or operations if shared outside of the organizations involved. Recipients may only share TLP:AMBER information with members of their own organization, and with clients or customers who need to know the information to protect themselves or prevent further harm. Sources are at liberty to specify additional intended limits of the sharing: these must be adhered to.


Limited disclosure, restricted to the community.
Sources may use TLP:GREEN when information is useful for the awareness of all participating organizations as well as with peers within the broader community or sector. Recipients may share TLP:GREEN information with peers and partner organizations within their sector or community, but not via publicly accessible channels. Information in this category can be circulated widely within a particular community. TLP:GREEN information may not be released outside of the community.


Disclosure is not limited.
Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction.