CVE-2026-86121

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.11% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 65.7% of scored records. A rank, not a probability.

NVD base score

9.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS 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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-24.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-05 09:59Z1 MO AGO

Last updated

2026-09-24 14:21Z1 MO AGO

Reserved

2026-09-05

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS 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

Weaknesses

• CWE-306Missing Authentication for Critical FunctionBase

Data version

5.2

Document digest

d5c955332a8403331320283e6a57017e5f69e4b4e3b52f7353af9a67a88f2962

• github.comGitHub Issue #1892https://github.com/trycua/cua/issues/1892issue-tracking
• github.comServer.auth allow-all when CONTAINER_NAME is unsethttps://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/main.pytechnical-description
• github.comCLI --host default of 0.0.0.0https://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/cli.pytechnical-description
• github.comBind default changed to 127.0.0.1https://github.com/trycua/cua/commit/59cf25c0ec54patch
• github.comhttps://github.com/trycua/cuaproduct
• www.vulncheck.comVulnCheck Advisory: Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Controlhttps://www.vulncheck.com/advisories/cua-computer-server-before-0.3.42-unauthenticated-rce-via-desktop-controlthird-party-advisory