CVE-2026-82876

Phison PS3111-S11 Controller Firmware Signature Verification Bypass

Published Aug 31, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Phison Electronics Corporation
Phison Electronics Corporation ps3111-s11 Controller Firmware
Vendors & Products Phison Electronics Corporation
Phison Electronics Corporation ps3111-s11 Controller Firmware
Type Values Removed Values Added
Description 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.
Title Phison PS3111-S11 Controller Firmware Signature Verification Bypass
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 2, 2026, 2:57 PM
Reserved
Aug 31, 2026, 8:38 AM
Status
Awaiting Analysis
Published
Aug 31, 2026, 11:16 AM
Modified
Sep 10, 2026, 3:47 PM