CVE-2026-35273MalwarePublished 26 Sep 2026Updated 26 Oct 2026

ShinyHunters Renewed Mass Exploitation Campaign Targeting Oracle PeopleSoft

Affects Oracle PeopleSoft Enterprise PeopleToolsSource AlienVault OTX General

Authoritative record:CVE-2026-35273· Critical 9.8

Malicious package : remove peoplesoft-enterprise-peopletolls and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 09:16 UTC

CVSS 3.1 base score

9.8Critical

How severe the flaw is on the 0–10 CVSS scale.

KEV deadline: 15 Jun 2026 US federal agencies must patch by this date; a sensible deadline for everyone else.
Ransomware: Used in ransomware campaigns
EPSS: 96.6% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 11 Jun 2026
Detectable: evidence found.
nuclei template: Oracle PeopleSoft PeopleTools PSEMHUB - Pre-Auth Java Deserialization RCE
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: evidence found.
Listed in CISA KEV 1 day after disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

CVE ID reserved
by Oracle
1 Apr 202620:03 UTC, 71 days before disclosure
CVE published
on cve.org
11 Jun 202602:25 UTC, t = 0
In Threat Radar
record ingested
11 Jun 202603:30 UTC, 1 hour after disclosure
Added to CISA KEV (opens in a new tab)
exploitation confirmed · ransomware use known
12 Jun 2026, 1 day after disclosure
KEV remediation due
US federal deadline
15 Jun 2026, 4 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Remove peoplesoft-enterprise-peopletolls from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected software

Product	Affected	Fixed in
Oracle CorporationPeopleSoft Enterprise PeopleTools	Affected =8.61 =8.62	Fixed in–
Mavencom.oracle/peoplesoft-enterprise-peopletolls`pkg:maven/com.oracle/peoplesoft-enterprise-peopletolls`Other threats	Affected =8.61 =8.62	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

UNC6240 (ShinyHunters) has resumed a mass exploitation campaign targeting Oracle PeopleSoft systems worldwide by exploiting CVE-2026-35273. The attacker bypassed web application firewall protections using URL encoding to access a vulnerable endpoint. Post-exploitation, multiple web shells, a trojanized backdoor (SIDEEYE), tunneling tools, and persistence agents were deployed. The actor conducted reconnaissance, credential theft, and prepared for data exfiltration, indicating potential extortion activities.

Impact

Successful exploitation allows attackers to bypass WAF protections and gain unauthorized access to Oracle PeopleSoft systems. This leads to deployment of web shells and backdoors, enabling persistent access, reconnaissance, credential theft, and preparation for data exfiltration. The attacker's actions pose risks of data compromise and potential extortion against affected organizations.

Defensive guidance

Organizations should verify and update WAF rules to detect and block URL-encoded bypass attempts targeting the Environment Management Hub endpoint. Monitoring for deployment of known web shells (x.jsp, u.jsp), the SIDEEYE backdoor, Neo-ReGeorg tunneling tools, and MeshAgent is recommended. Implementing strict access controls and credential monitoring on Oracle PeopleSoft systems is advised.

CWE-306Missing Authentication for Critical Function (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #21OWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Architecture and Design
Divide the software into anonymous, normal, privileged, and administrative areas. Identify which of these areas require a proven user identity, and use a centralized authentication capability.
Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks…
Architecture and Design
Where possible, avoid implementing custom, "grow-your-own" authentication routines and consider using authentication capabilities as provided by the surrounding framework, operating system, or environment.
OWASP Cheat Sheets
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V1.2.3 (opens in a new tab)
V1.2.2 (opens in a new tab)
V1.2.4 (opens in a new tab)
Attack patterns
Choosing Message Identifier (opens in a new tab)
Force the System to Reset Values (opens in a new tab)
Using Unpublished Interfaces or Functionality (opens in a new tab)
Cross Site Request Forgery (opens in a new tab)
Communication Channel Manipulation (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

Indicators of compromise

Domains 4

azurenetfiles.net
microsoft-entra.net
winmanage-me.network
enroll.azuredevice.cloud

Hashes 5

2bee941fb40519d0d1ec52bd79a8f63fc65aac6455c8f2d6b668e3360dfdb5d7
3ba215692665513abfffd4e815c5c45f2d41e5dcc4283a2a3b740930c5c417c3
419c571ee38b7e7266d130c4b6bbc4dd0ef44d6e5f3bc02cc2cf73b762f07c86
48b4a0827da7bbfce9fb52464f8a659dea7a035189c52c506c0bfb4b1c3fe494
ba14419beb2ec0bb94cab6298c14d7fb3e1d819366fe378290c0c2a4d97f7e07

CVEs 1

CVE-2026-35273

Community reviews

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Exploitation evidence

Timeline

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 07:07 UTC

Public exploits and detectiona Nuclei detection template

WeaknessesCWE-306

MITRE ATT&CK techniques14 from threat tags

Technical details

Indicators of compromise

Domains 4

Hashes 5

CVEs 1

Community reviews

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