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Vulnerabilities

Vulnerability · CVE-2025-15556

Notepad++ Download of Code Without Integrity Check Vulnerability

Published Feb 2, 2026 · catalog updated Jun 17, 2026 · Notepad++ Notepad++

Patch now

CVE-2025-15556 is in the CISA known-exploited catalog, due Mar 5, 2026. Confirm Notepad++ Notepad++ against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High7.7
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.77%
Remediation
Remediation guidance
Affected products
cpe notepad-plus-plus/notepad++ · vendor Notepad++ Notepad++

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe notepad-plus-plus/notepad++version unspecified
  • vendor Notepad++ Notepad++version unspecified

How to fix CVE-2025-15556

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-15556 is in the CISA known-exploited catalog, due Mar 5, 2026. Confirm Notepad++ Notepad++ against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-494. EPSS 1.77%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 2, 2026 · Catalog

    Detected

    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

  2. Feb 12, 2026 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Mar 5, 2026 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Jun 17, 2026 · Catalog

    Updated

    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

Sources

  • CISA KEVConfirmed exploitationCVE-2025-15556

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2025-15556

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-15556

    30-day exploitation probability 1.8%

    first.org
  • NIST NVDVulnerability recordCVE-2025-15556

    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 upda

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2025-15556

    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 wi

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.