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CISA KEV·Added 2026-02-12 — agencies required to remediate by 2026-03-05

CVE-2025-15556

HIGH
Published
Feb 3, 2026
Updated
Apr 12, 2026
Affected
0 pkgs
Patched
None yet
Exploits
None indexed

EPSS Exploitation Probability

via FIRST.org ↗
9.1%probability of exploitation in next 30 days
Lower Risk93th percentile+3.03%
0.76%4.19%7.62%11.1%2.7%5.3%6.1%6.1%9.1%Mar 26May 26Jun 26

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2025-15556 in your stack?

O3 detects CVE-2025-15556 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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