Auth bypass in Phison Electronics Corporation Ps3111-S11 Controller Firmware
CVE-2026-84696
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (11.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- Phison Electronics Corporation Ps3111-S11 Controller Firmware — versions SBFQT1.3
Weakness classification (CWE)
References
- github.com/trulycrisp/disksec (exploit)
- github.com/trulycrisp/psychite (exploit)
- trulycrisp.github.io/drivefirmware/phison_s11/ (technical-description)
- www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-missing-auth… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-84696?
- CVE-2026-84696 is a high-severity vulnerability in Phison Electronics Corporation Ps3111-S11 Controller Firmware, classified under Missing Authentication for Critical Function. CVSS score: 8.2/10. Published 2026-09-02.
- How severe is CVE-2026-84696?
- High severity. CVSS v3 base score is 8.2 out of 10.