CVE-2026-82876: Improper Verification of Cryptographic Signature in Phison Electronics Corporation PS3111-S11 Controller Firmware
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.
CVE-2026-82876: Improper Verification of Cryptographic Signature in Phison Electronics Corporation PS3111-S11 Controller Firmware
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.
CVSS v4.0
Score 9.3critical
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-31T08:38:43.268Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
Threat ID: 6a95607cacd9273b49fd6f28
Added to database: 08/31/2026, 11:07:40 UTC
Last updated: 08/31/2026, 11:07:40 UTC
Views: 1
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