CVE-2026-84696Public exploit

Persistent firmware implants via defeatable VUC authentication

Published Sep 2, 2026 · Updated Sep 2, 2026

Missing authentication in Phison PS3111-S11 Controller Firmware through SBFQT1.3 allows local users to access privileged ATA commands. The controller either omits the VUC lock or protects its challenge response with a reversible CRC-16 stream cipher, exposing memory and raw-flash reads and writes. High host privileges and direct ATA access are required; successful writes can install controller implants that persist across power cycles.

CVSS severity8.2
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Phison PS3111-S11 Controller Firmware through SBFQT1.3 allows local users to access privileged ATA commands. The controller either omits the VUC lock or protects its challenge response with a reversible CRC-16 stream cipher, exposing memory and raw-flash reads and writes. High host privileges and direct ATA access are required; successful writes can install controller implants that persist across power cycles.

The record

CVE
CVE-2026-84696
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
Phison Electronics Corporation
Product
PS3111-S11 Controller Firmware
Classifications
CWE-306, T1542.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=SBFQT1.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Phison Electronics Corporation · PS3111-S11 Controller Firmwareversion=SBFQT1.3

Published CVSS scores

8.2VulnCheckCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1542.001Pre-OS Boot: System Firmware

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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