Oracle PeopleSoft PeopleTools PSEMHUB pre-auth RCE (CVSS 9.8), zero-day exploited by UNC6240/ShinyHunters

Nissan is the largest named victim yet in the ShinyHunters Oracle PeopleSoft campaign

UPDATE · originally covered NAIC breached via Oracle PeopleSoft zero-day; ShinyHunters publishes 3.1 TB of US insurance-regulatory data and rating-agency feeds pause (2026-06-28)

Nissan disclosed that current and former employees' data was exposed via CVE-2026-35273, the Oracle PeopleSoft PeopleTools pre-auth flaw exploited as a zero-day between 2026-05-27 and 2026-06-09 as part of the wider ShinyHunters campaign (SecurityWeek, 2026-06-30). The exposure spans current and former employees in the US, Canada, Mexico and Brazil, potentially including Social Security numbers, banking/direct-deposit information and tax records.

This is a materially different victim profile from the previously-covered NAIC breach — employee HR/payroll PII rather than regulatory data — showing the campaign spreading across both regulatory-body and corporate-HR PeopleSoft deployments. As mitigation, Nissan restricted pay-slip viewing and direct-deposit changes to company-network/VPN-authenticated sessions and is offering credit/dark-web monitoring (BleepingComputer, 2026-06-29). ShinyHunters' self-reported scale of "over 300 PeopleSoft instances across ~100 organizations" is an unverified actor claim — attribute the claim, not confirmed fact. No new technical detail beyond victim-count expansion; the operative guidance from the 2026-06-28 NAIC item stands (patch CVE-2026-35273; remove internet-exposed PeopleSoft PeopleTools from public reachability).

ShinyHunters / UNC6240 Oracle PeopleSoft campaign

The campaign behind the § 1 NAIC breach. GTIG/Mandiant attributes to UNC6240 an active zero-day exploitation of Oracle PeopleSoft (CVE-2026-35273) between May 27 and June 9, predating Oracle's advisory; staging environments deployed customised MeshCentral agents masquerading as cloud endpoints, then ran a per-victim [victim]_fanout.sh lateral-movement-and-defacement script (Google GTIG). ~300 PeopleSoft instances compromised, ~100 organisations notified, 68% higher education, with the University of Nottingham among the first named public victims (SecurityWeek). The status this week: NAIC confirmed (§ 1), and notifications are still landing, so more European education and public-finance victims are likely. The weekly lens: this is ShinyHunters operating as a zero-day-capable ERP attacker — a capability shift from the brand's 2021–2024 credential-stuffing persona. Outstanding question: which EU universities running PeopleSoft are in the un-notified tail.

NAIC breached through an Oracle PeopleSoft zero-day; ShinyHunters dumps 3.1 TB and US rating-agency feeds stall

If you did nothing this week: any internet-reachable Oracle PeopleSoft instance is a live pre-auth foothold — the same zero-day path that put the US National Association of Insurance Commissioners into ShinyHunters' hands, and PeopleSoft is widely deployed across European public administration, higher education and HR/finance back offices. The W25 looking-ahead flagged that ShinyHunters PeopleSoft notifications were still landing and that EU universities were a probable next-named class; NAIC is the fresh high-profile confirmation that the campaign is still acquiring victims.

NAIC — the standard-setting body for all 50 US state insurance regulators — confirmed on 2026-06-26 that an unauthorised party reached its environment on June 11 via an Oracle PeopleSoft vulnerability, then pivoted from PeopleSoft to temporary access to data-storage areas. ShinyHunters claims 3.1 TB exfiltrated (TechRadar, Insurance Journal). The operational tell is the downstream impact NAIC itself disclosed: credit-rating agencies paused their data feeds and NAIC suspended assigning designations to insurer investments — a regulatory-process outage, not just a data-confidentiality event. This is the same PeopleSoft exploitation wave (CVE-2026-35273, the unauthenticated RCE in PeopleTools Environment Management) Google GTIG attributes to UNC6240/ShinyHunters and has been tracking against the education sector — 68% of identified targets were higher-education institutions; Treat any externally-reachable PeopleSoft portal (/PSEMHUB/, /PSIGW/HttpListeningConnector) as a hunt target, not a patch-later item. (daily 06-28)