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

In short

BeyondTrust Remote Support has a weakness classified as authentication bypass by spoofing (CWE-290). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-10-16. NVD lists CVSS 4.0 at 9.3 CRITICAL.

What it is

“BeyondTrust Remote Support contains an authentication bypass by spoofing vulnerability that could allow a remote attacker to perform file operations on the appliance.” — CISA KEV, retrieved 2026-11-01

“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.” — NVD, retrieved 2026-11-01

Who is affected

BeyondTrust Remote Support. NVD lists the following versions as affected:

• Versions through 26.2.3

Exploitation status

CISA KEV added: 2026-10-16. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-10-19.

Scores

NVD CVSS 4.0: 9.3 CRITICAL; vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source 13061848-ea10-403d-bd75-c83a022c2891.

EPSS by FIRST: 18.95%; percentile 97.30; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-290.

Timeline

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 KEV

What to do

• Confirm whether you run BeyondTrust Remote Support and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• US Government Resource: https://nvd.nist.gov/vuln/detail/CVE-2026-102764
• Vendor Advisory: https://www.beyondtrust.com/blog/entry/bt26-05
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.