Adversaries launch headline-making attacks against vulnerable Confluence Servers worldwide. Atlassian alerts their users to the security risks associated with an RCE flaw detected in all supported versions of Confluence (Server and Data Center). The bug is tracked as CVE-2022-26134, with the vendor rating it to be of the highest severity level. As of the 3d of June 2022, there are no patches to fix this vulnerability in Atlassian’s corporate wiki.
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The vulnerability in Confluence was first spotted by Volexity just recently, over a Memorial Day weekend. According to the researchers, threat actors leveraged the zero-day injection vulnerability to acquire full system access and plant the Behinder web shell for further malicious actions.
Due to the lack of a patch, Atlassian recommends that administrators ban external access to Confluence servers. Currently, there is no data on cloud-hosted servers being affected by this security hole.
Last August, the company disclosed another critical bug in its product that allowed unauthenticated users to execute arbitrary code on devices with Confluence Server or Confluence Data Center installed. The injection flaw was assigned CVE-2021-26084.
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