Is CVE-2026-55408 actively exploited?

No active exploitation of CVE-2026-55408 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-55408 be exploited remotely?

No. CVE-2026-55408 requires local access to exploit.

What is the CVSS score of CVE-2026-55408?

CVE-2026-55408 has a CVSS score of 8.4 (HIGH).

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HIGH

CVE-2026-55408

CWE-94Published: July 7, 2026· Updated: Jul 8, 2026

8.4

CVSS v3.1

EPSS:0.19%probability of exploitation in 30 daysPercentile:8.5th

Official Description

Koodo Reader is an ebook reader. In version 2.3.0 and earlier, Koodo Reader is vulnerable to remote code execution through malicious EPUB files because the open-book IPC handler enables nodeIntegrationInSubFrames and EPUB chapter content is rendered with unsanitized innerHTML. An attacker can craft an EPUB book that, when imported and opened by the victim, instantiates a hidden iframe with Node.js API access and executes arbitrary operating system commands with the victim user's privileges. This issue is fixed in version 2.3.1.

NVD Source

Technical Analysis

CVE-2026-55408 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (A) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges Req.None

User InteractionA

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X