What is CVE-2026-82876?

CVE-2026-82876 is a high-severity vulnerability in Phison Electronics Corporation Ps3111-S11 Controller Firmware, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.2/10. Published 2026-08-31.

How severe is CVE-2026-82876?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Phison Electronics Corporation Ps3111-S11 Controller Firmware

CVE-2026-82876

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 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.

Affected products

Phison Electronics Corporation Ps3111-s11 Controller Firmware — versions SBFQT1.3

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-82876?: CVE-2026-82876 is a high-severity vulnerability in Phison Electronics Corporation Ps3111-S11 Controller Firmware, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.2/10. Published 2026-08-31.
How severe is CVE-2026-82876?: High severity. CVSS v3 base score is 8.2 out of 10.