SEPTEMBER 18, 2026
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Case File

CVE-2026-82876

HIGH · CVSS 8.2 EPSS 0.09% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-31 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

The Phison PS3111-S11 controller firmware is vulnerable due to its method of verifying RSA signatures, which relies on a public modulus stored within the firmware instead of secure, immutable storage. This flaw allows attackers to create arbitrary RSA key pairs, sign malicious firmware, and have it accepted as legitimate by the controller, potentially leading to unauthorized firmware modifications and system compromise. Organizations using devices with this controller should prioritize patching or mitigating this vulnerability to protect against potential exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-82876
Severity
HIGH
CVSS
8.2
EPSS
0.09%

Original NVD 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.