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Oracle PeopleSoft bug used by ShinyHunters is three chained flaws, ZDI says
Researchers at the Zero Day Initiative said the Oracle PeopleSoft issue tracked as CVE-2026-35273 is three chained bugs, The Hacker News reported.
- New headline Was: “ShinyHunters-Exploited Oracle PeopleSoft Zero-Day Turns Out to Be Three Chained Flaws”
- Our desk filed its story
The Oracle PeopleSoft flaw exploited since May by a group tracked as ShinyHunters is three chained vulnerabilities, not one, according to the Zero Day Initiative researchers who reported it, The Hacker News said1.
Oracle issued an out-of-band patch under a single identifier, CVE-2026-35273, on June 101. The entry covers PeopleSoft Enterprise PeopleTools 8.61 and 8.62, carries a CVSS score of 9.8, and is listed in CISA's Known Exploited Vulnerabilities catalog1. ZDI said it is working with Oracle to assign a separate CVE to each bug; as of this week only the June identifier was on the record1.
Bobby Gould of ZDI described the chain as starting with server-side request forgery in the Integration Gateway, which can reach an internal Environment Management Hub that trusts the loopback address by default1. From there, ZDI said, an attacker can reach remote code execution without a login1.
Mandiant and Google Threat Intelligence Group attributed exploitation between May 27 and June 9, mostly against universities, to UNC6240, also known as ShinyHunters1. Because that activity preceded Oracle's June 10 alert, The Hacker News treated it as a zero-day campaign1.
In September, Mandiant reported a larger wave that reached technology, IT services, healthcare, agriculture, transport and government systems worldwide1. Mandiant said some attackers bypassed web application firewall rules that matched a plain-text admin path by encoding a character in the request1.
Oracle's guidance, as summarized by The Hacker News, is to install the CVE-2026-35273 fix and remain on a supported PeopleTools release1. If a patch cannot be applied yet, Oracle advised disabling the Environment Management Hub in multi-server setups or removing that application in single-server setups1. Mandiant said path-based WAF blocking is not a substitute for patching1.
Mandiant recommended treating any host with a web shell as compromised, preserving evidence, and rotating credentials reachable from the PeopleSoft tier, The Hacker News said1. The Hacker News noted that Oracle's alert does not say whether the patch removes access an attacker already has1.
