US Cyber Command (USCYBERCOM) has issued a rare alert today urging US organizations to patch a massively exploited Atlassian Confluence critical vulnerability immediately.
“Mass exploitation of Atlassian Confluence CVE-2021-26084 is ongoing and expected to accelerate,” said Cyber National Mission Force (CNMF).
The USCYBERCOM unit also stressed the importance of patching vulnerable Confluence servers as soon as possible: “Please patch immediately if you haven’t already— this cannot wait until after the weekend.”
This warning comes after Deputy National Security Advisor Anne Neuberger encouraged organizations “to be on guard for malicious cyberactivity in advance of the holiday weekend” during a Thursday White House press briefing.
It’s the second alert of this kind in the last 12 months, the previous one (from June) notifying that CISA was aware that threat actors might attempt to exploit a remote code execution vulnerability affecting all vCenter Server installs.
CISA also urged users and admins today to immediately apply the Confluence security updates recently issued by Atlassian.