High 8.2Published Aug 31, 2026

CVE-2026-82876Phison PS3111-S11 Controller Firmware Signature Verification Bypass

Updated under an hour ago (2026-10-19 10:23 UTC)

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It affects Phison Electronics Corporation PS3111-S11 Controller Firmware. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Phison Electronics Corporation PS3111-S11 Controller Firmware

Exploited in the last 30 days

Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.

CVSS: 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Sep 2, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Phison Electronics Corporation PS3111-S11 Controller Firmware phison_electronics:ps3111_s11_controller_firmware (from the name)	SBFQT1.3	CNA record

References

https://trulycrisp.github.io/drivefirmware/phison_s11/technical-description
https://github.com/trulycrisp/psychiteexploit
https://www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-signature-verification-bypassthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.