CVE-2026-82876 (GCVE-0-2026-82876)
Vulnerability from cvelistv5 – Published: 2026-08-31 10:51 – Updated: 2026-09-02 14:57
VLAI
EPSS
VEX
Title
Phison PS3111-S11 Controller Firmware Signature Verification Bypass
Summary
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.
Severity
8.2 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 14:57 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck
CNA
References
3 references
| URL | Tags |
|---|---|
| https://trulycrisp.github.io/drivefirmware/phison_s11/ | technical-description |
| https://github.com/trulycrisp/psychite | exploit |
| https://www.vulncheck.com/advisories/phison-ps311… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Phison Electronics Corporation | PS3111-S11 Controller Firmware |
Affected:
SBFQT1.3
(custom)
|
Date Public
2026-06-08 00:00
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