CVE-2026-102764: BeyondTrust Remote Support Authentication Bypass by Spoofing Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Yes, if you run BeyondTrust Remote Support. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-10-16, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-10-19; treat that as the outer limit, not the target.
• EPSS 1.2%, percentile 67: FIRST’s model estimates a 1.2% chance of exploitation activity in the next 30 days, higher than 67% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Editorial verdict: Act now. BeyondTrust Remote Support CVE-2026-102764 Zero-Day — If you run a self-hosted BeyondTrust Remote Support appliance, patch it today and assume it may already be compromised; an espionage group used this as a zero-day for about seven weeks.

What it is

The vulnerability exists within internal components of BeyondTrust’s Remote Support product. The components did not adequately validate the origin of the messages it received. Under the right conditions, this could allow an attacker to perform file operations on the appliance.

CISA’s summary

BeyondTrust Remote Support contains an authentication bypass by spoofing vulnerability that could allow a remote attacker to perform file operations on the appliance.

Weakness type: CWE-290.

Product: BeyondTrust Remote Support · Assigned by: BT · Published: 2026-10-15

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: added 2026-10-16; federal due date 2026-10-19. Known ransomware use: Unknown.
• CISA required action: 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.
• CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
• FIRST EPSS (model of 2026-10-21): 1.18% probability of exploitation activity in the next 30 days; percentile 67.

Timeline

• 2026-10-15 — CVE record published by BT
• 2026-10-15 — erroneo.us brief: BeyondTrust Remote Support CVE-2026-102764 Zero-Day
• 2026-10-16 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2026-10-17 — CVE record last updated
• 2026-10-19 — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. Listed in CISA KEV notes (beyondtrust.com) beyondtrust.com

Vulnerability records

1. CVE.org record CVE-2026-102764 cve.org
2. NVD entry CVE-2026-102764 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov
2. Listed in CISA KEV notes (cisa.gov) cisa.gov
3. Listed in CISA KEV notes (cisa.gov) cisa.gov

Other references from the CVE record and advisory

1. beyondtrust.com beyondtrust.com
2. beyondtrustcorp.service-now.com beyondtrustcorp.service-now.com

All exploited BeyondTrust vulnerabilities · Today’s Security Digest