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ShinyHunters uses WAF bypass trick in Oracle PeopleSoft attacks
The ShinyHunters extortion gang is using a URL-encoding trick to bypass web application firewall rules that mitigate the Oracle PeopleSoft CVE-2026-35273 flaw, allowing the threat actors to resume widespread exploitation of a flaw on vulnerable servers. [... ]
Attackers Bypass WAFs to Exploit Oracle PeopleSoft Flaw and Deploy Web Shells
Google is warning of renewed mass exploitation of a known security vulnerability in Oracle PeopleSoft as part of a campaign targeting multiple sectors globally. The ShinyHunters-linked activity involves the weaponization of CVE-2026-35273 (CVSS score: 9.8), a critical security flaw that could result in unauthenticated remote code execution. The vulnerability was first exploited as a zero-day
ShinyHunters Renewed Mass Exploitation Campaign Targeting Oracle PeopleSoft
Introduction As an update to the June 2026 post, ShinyHunters Targets Education Sector with Oracle PeopleSoft Exploit , Mandiant and Google Threat Intelligence Group (GTIG) have identified renewed mass exploitation of CVE-2026-35273 by UNC6240 (ShinyHunters), along with expanded global targeting across multiple sectors. In June, the threat actor exploited this vulnerability as a zero-day predominantly against academic institutions. This new wave of activity stems from UNC6240 modifying its exploit to bypass web application firewall (WAF) rules blocking the vulnerable Environment Management Hub (PSEMHUB) endpoint. The threat actor bypassed these string-based WAF rules by URL-encoding a single character in the request path, requesting /%50SEMHUB/ in place of /PSEMHUB/ .
15th June – Threat Intelligence Report
For the latest discoveries in cyber research for the week of 15th June, please download our Threat Intelligence Bulletin. TOP ATTACKS AND BREACHES • The University of Nottingham, a UK research university, has suffered a data breach after ShinyHunters accessed its student records system. The incident affected about 454,600 current and former students and exposed contact details, passport numbers, enrollment information, and fee payment records later appeared online. According to analysts, this breach is part of a larger wave of attacks targeting more than 100 organizations by ShinyHunters, exploiting CVE-2026-35273, a critical zero-day vulnerability in Oracle PeopleSoft that allows remote code execution.
ShinyHunters Targets Education Sector with Oracle PeopleSoft Exploit
Introduction Mandiant and Google Threat Intelligence Group (GTIG) have identified an active compromise and extortion campaign attributed to UNC6240 (ShinyHunters) targeting Oracle PeopleSoft application infrastructure. The activity was observed between May 27, 2026, and June 9, 2026 and is consistent with the exploitation of CVE-2026-35273 , a critical remote code execution vulnerability (CVSS 9. 8) in the Environment Management component. The exploitation of this vulnerability directly aligns with the observed targeting of Environment Management Hub (PSEMHUB) endpoints. Because this activity predates Oracle's June 10, 2026 advisory, the vulnerability was exploited as a zero-day. Upon becoming aware of active scanning and exploitation, we initiated notifications to over 100 global organizations whose IP addresses correlated with potentially vulnerable endpoints.
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