2026-05-08 · view entry permalink →
CVE-2026-5787 / CVE-2026-6973, Ivanti EPMM pre-auth certificate impersonation → admin RCE (CISA KEV deadline 2026-05-10)
Ivanti disclosed two vulnerabilities in Endpoint Manager Mobile (EPMM) on-premises that chain into a fully pre-authenticated remote code execution path against the MDM server. CVE-2026-5787 (CVSS 9.1, CWE-295) is an improper certificate validation flaw: an unauthenticated attacker who can reach the EPMM administrative network interface sends a crafted Sentry host registration request. EPMM fails to verify that the connecting host is an already-registered Sentry gateway and issues the attacker valid CA-signed client certificates with Sentry-level trust. Those certificates satisfy the authentication gate for CVE-2026-6973 (CVSS 7.2, CWE-20), where improper input validation in an administrative API endpoint allows the now-"authenticated" actor to execute arbitrary OS commands at the EPMM service account's privilege level. The nominal "admin required" label on CVE-2026-6973 is therefore misleading; in practice the chain requires no prior credentials.
CISA added CVE-2026-6973 to the Known Exploited Vulnerabilities catalog (deadline 2026-05-10) on the same day Ivanti disclosed the vulnerabilities (2026-05-07). Ivanti reported "very limited exploitation in the wild" at disclosure; CISA's simultaneous KEV listing confirms verified exploitation. Only on-premises EPMM is affected; Ivanti Neurons for MDM (cloud), EPM, Sentry as a standalone product, and EPMM mobile clients are unaffected. An estimated 508 EPMM on-premises instances in the EU are internet-reachable (Censys/Shodan telemetry), concentrated in public-sector and healthcare verticals, both NIS2 Annex-I essential entities.
Fixed versions: 12.6.1.1 (12.6.x branch), 12.7.0.1 (12.7.x branch), 12.8.0.1 (12.8.x branch).
Immediate actions if patching within 24 hours is not feasible: Remove EPMM port 443 from internet exposure; place admin interface behind VPN with allowlisted management IPs; disable internet-facing Sentry registration endpoints; audit EPMM logs for unexpected Sentry host_id registration events.
Ivanti disclosed two vulnerabilities in Endpoint Manager Mobile (EPMM) on-premises that chain into a fully pre-authenticated remote code execution path against the MDM server.
UPDATE (originally covered 2026-05-08; previous UPDATE 2026-05-09): The CISA KEV remediation deadline for CVE-2026-6973 (Ivanti EPMM admin API improper input validation → RCE, CVSS 7.2) expired today (2026-05-10) (Ivanti PSIRT, 2026-05-07 · BleepingComputer, 2026-05-07 · SecurityWeek, 2026-05-08).
The CISA KEV deadline for CVE-2026-6973 (Ivanti EPMM admin API RCE, CVSS 7.2) is tomorrow, 2026-05-10. Organisations that have not yet isolated or patched on-premises Ivanti EPMM instances are in immediate compliance breach. CERT-FR CERTFR-2026-AVI-0552 and BSI advisory from 2026-05-07 both require organisations to treat the CVE-2026-5787 → CVE-2026-6973 chain as a single critical exposure requiring immediate action, with 508 EU on-premises instances identified as internet-accessible by NCSC-NL scanning as of 2026-05-07.
Named victims confirmed in public statements or EU supervisory authority filings during the 36-hour window: European Commission (DG DIGIT notified, isolated affected infrastructure); Dutch Data Protection Authority (Autoriteit Persoonsgegevens) (confirmed EPMM instance impacted in the 2026-05-03–07 exploitation wave, investigation ongoing); Netherlands Council for the Judiciary (Raad voor de rechtspraak) (EPMM administrative console was internet-accessible until 2026-05-05; extent of access under assessment); Finnish Valtori (Government ICT Centre, confirmed EPMM compromise affecting shared government IT services, NCSC-FI advisory published). All named organisations used EPMM in MDM capacity, meaning the exposed admin APIs had device management access to enrolled endpoints including mobile devices of employees with elevated privilege.
Credential-chaining risk: Ivanti disclosed a separate cluster of EPMM vulnerabilities in January 2026 (CVE-2026-1281 and CVE-2026-1340, tracked separately) in which admin-account credentials were extracted from compromised instances. Organisations that patched CVE-2026-1281/1340 at the time but did not rotate admin credentials remain at elevated risk that the May 2026 exploitation wave leveraged pre-extracted credential sets to accelerate authentication bypass to direct post-auth RCE.
The CISA KEV remediation deadline for CVE-2026-6973 (Ivanti EPMM admin API improper input validation → RCE, CVSS 7.2) expired today (2026-05-10) (Ivanti PSIRT, 2026-05-07 · BleepingComputer, 2026-05-07 · SecurityWeek, 2026-05-08).
Shadowserver telemetry cited by BleepingComputer counts ~850 internet-exposed EPMM instances globally with 508 in Europe and 182 in North America, i.e. European EPMM exposure is materially larger than the rest of the world combined. SecurityWeek's analysis notes a Chinese-actor assessment based on historical EPMM exploitation patterns; Ivanti has confirmed exploitation against "a very limited number of customers" without naming them.
The May 2026 EPMM update covers four additional CVEs alongside CVE-2026-6973: CVE-2026-5786 (CVSS 8.8, remote authenticated → administrative-access via improper access control), CVE-2026-5788 (CVSS 7.0, unauthenticated arbitrary method invocation), CVE-2026-5787 (improper certificate validation → pre-auth Sentry impersonation, originally covered in the 2026-05-08 brief deep dive) and CVE-2026-7821 (also high-severity per BleepingComputer / SecurityWeek). Critically, the same May patch supersedes the prior CVE-2026-1281 / CVE-2026-1340 RPM workaround issued for the January 2026 unauthenticated RCEs, meaning EPMM operators that are still on the January workaround need to apply the proper patch now. Fixed builds: 12.6.1.1, 12.7.0.1, 12.8.0.1.