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CVE-2026-82876— Phison PS3111-S11 Controller Firmware Signature Verification Bypass

Quick assessment

Affected
Phison Electronics Corporation PS3111-S11 Controller Firmware
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

群联（Phison）PS3111-S11 控制器的固件在验证 RSA 签名时，使用的是嵌入在固件镜像内部的公钥模数（public modulus），而非将其锚定在不可变存储区中。攻击者可以生成任意的 RSA 密钥对，使用私钥对修改后的固件进行签名，并将对应的公钥模数嵌入到签名段中；控制器随后会将这个被篡改的固件视为有效。

CVSS 8.2 · High EPSS 0.09% · P0

Affected Version Matrix 1

VendorProduct Version RangeStatus
Phison Electronics Corporation PS3111-S11 Controller Firmware SBFQT1.3 affected
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I. Basic Information for CVE-2026-82876

Vulnerability Information
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Vulnerability Title
Phison PS3111-S11 Controller Firmware Signature Verification Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Phison Electronics Corporation PS3111-S11 Controller Firmware SBFQT1.3 -

II. Public POCs for CVE-2026-82876

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III. Intelligence Information for CVE-2026-82876

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Other References for CVE-2026-82876 (1)

IV. Related Vulnerabilities

Same product: PS3111-S11 Controller Firmware
Same vendor: Phison Electronics Corporation
Same weakness: CWE-347

V. Comments for CVE-2026-82876

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