Pierluigi Paganini
June 30, 2026
A critical vulnerability in Oracle E-Business Suite, tracked as CVE-2026-46817, is being actively exploited in the wild, according to cybersecurity firm Defused Cyber.
“CVE-2026-46817 (CVSS 9.8 unauth HTTP takeover in Oracle E-Business) is being exploited Over the weekend, we observed an actor exploiting the vulnerability on our Oracle E-Business honeypots.” reads the post on X published by the cybersecuriyt firm. “This vulnerability has no known previous exploitation and no public POC code exists.”
The flaw affects Oracle Payments versions 12.2.3 through 12.2.15 and allows unauthenticated attackers to take over vulnerable systems over HTTP. Oracle fixed the issue in last month’s Critical Patch Update and urges customers to apply the patches immediately.
Defused Cyber did not disclose technical details about the attacks that exploited the flaw or the motivation of the attackers.
In mid June, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) added Oracle PeopleSoft Enterprise PeopleTools flaw, tracked as CVE-2026-35273 (CVSS score of 9.8), to its Known Exploited Vulnerabilities (KEV) catalog.
Oracle PeopleSoft Enterprise PeopleTools is the underlying technology platform used to build, run, administer, and customize Oracle PeopleSoft applications.
The flaw CVE-2026-35273 is a remote code execution vulnerability in Oracle PeopleSoft’s Environment Management component. No authentication required. No user interaction required. Just network access to the Environment Management Hub endpoint and you can take over the server.
Mandiant and Google’s Threat Intelligence Group published an analysis of an active ShinyHunters campaign on June 11, one day after Oracle finally issued an advisory for the vulnerability being exploited. The gap matters: the activity ran from May 27 to June 9, meaning every organization hit during those two weeks was dealing with a zero-day, a flaw with no available patch and no official vendor warning. Sixty-eight percent of the more than 100 organizations Mandiant notified were universities and colleges, most of them in the United States.
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