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🚨 ShinyHunters resumes mass exploitation of critical Oracle PeopleSoft flaw using simple WAF bypass.
Mandiant and Google Threat Intelligence Group have identified renewed mass exploitation of CVE-2026-35273 by UNC6240, also known as ShinyHunters.
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The critical vulnerability allows unauthenticated remote code execution in Oracle PeopleSoft PeopleTools and carries a CVSS score of 9.8.
Oracle released an emergency patch on June 10.
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The new campaign targets organizations that attempted to mitigate the flaw using web application firewall rules but did not install the patch.
ShinyHunters bypassed rules blocking the vulnerable /PSEMHUB/ endpoint by encoding a single character and sending requests to /%50SEMHUB/.
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Google says web shells were deployed on dozens of systems worldwide across:
• Higher education
• Technology
• IT services
• Healthcare
• Agriculture
• Transportation
• Government
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The actors deployed web shells, the SIDEEYE backdoor, Neo-reGeorg tunneling tools and MeshAgent for persistent remote access.
Around one-quarter of the observed commands executed with root or SYSTEM privileges.
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Organizations running PeopleSoft should patch immediately, disable or remove the Environment Management Hub where possible and investigate encoded variants of /PSEMHUB/ in access logs.
WAF rules alone are not sufficient.