What’s Vulnerable › Vulnerabilities

CVE-2026-84696: Phison PS3111-S11 Controller Firmware Missing Authentication on Vendor Unique Commands

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-10
• Weakness: CWE-306

Description

Phison PS3111-S11 controller firmware versions through SBFQT1.3 expose privileged vendor unique commands over the ATA interface with absent or defeatable authentication mechanisms. Attackers can bypass the weak CRC-16 based unlock handshake or exploit builds with no VUC lock to read and write controller memory and raw flash, persisting implants across power cycles.

Affected products

• Phison Electronics Corporation PS3111-S11 Controller Firmware: SBFQT1.3

References

• https://github.com/trulycrisp/disksec
• https://github.com/trulycrisp/psychite
• https://trulycrisp.github.io/drivefirmware/phison_s11/
• https://www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-missing-authentication-on-vendor-unique-commands

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