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HIGH

CVE-2026-82876

CVSS v3

8.2

HIGH

EPSS Score

0.1 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

Published
2026-08-31
Last Modified
2026-08-31

Frequently asked questions

What is 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.

Is CVE-2026-82876 actively exploited?

Active exploitation of CVE-2026-82876 has not been confirmed. Its EPSS score was 0.1% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-82876?

CVE-2026-82876 has a CVSS v3 base score of 8.2 (HIGH severity).

Is CVE-2026-82876 affecting your environment?

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