CVE-2025-15556

criticalknown exploitedpublic exploitcovered by 1 sourcefirst seen 2026-02-12

Actively exploited. CVE-2025-15556 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-12) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

Public exploit code is available. Proof-of-concept or working exploit code for CVE-2025-15556 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.

Notepad++ when using the WinGUp updater, contains a download of code without integrity check vulnerability that could allow an attacker to intercept or redirect update traffic to download and execute an attacker-controlled installer. This could lead to arbitrary code execution with the privileges of the user.

CSIRTS triage

vendor: Notepad++product: Notepad++Supply chain

What: Notepad++ contains a download of code without integrity check vulnerability.
Who is affected: Users of Notepad++ using the WinGUp updater.
Urgency: Remediation is urgent due to active exploitation and critical severity.
Action: Update Notepad++ to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 66% of all EPSS-scored CVEs.

Exploit availability

Public exploit or proof-of-concept code for CVE-2025-15556 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.

GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗

Advisory coverage (1)

criticalexploitedCVE-2025-15556: Notepad++ Download of Code Without Integrity Check Vulnerabilitycisa-kev · 2026-02-12

External references

NVD record for CVE-2025-15556

CVE.org record

CISA KEV catalog

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