CVE-2025-15556 PoC — Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification

Source

https://github.com/renat0z3r0/notepadpp-supply-chain-iocs

Associated Vulnerability

Title: Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification (CVE-2025-15556)
Description:Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification vulnerability where downloaded update metadata and installers are not cryptographically verified. An attacker able to intercept or redirect update traffic can cause the updater to download and execute an attacker-controlled installer, resulting in arbitrary code execution with the privileges of the user.

Description

IoCs and detection rules for the Notepad++ supply chain attack (CVE-2025-15556) — Lotus Blossom APT, June–December 2025. Includes Falcon LogScale queries, YARA/Sigma rules, and MITRE ATT&CK mapping.

File Snapshot

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