CVE-2025-15556Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification
Updated under an hour ago ()
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It affects notepad-plus-plus and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Feb 12, 2026; federal agencies had to remediate by Mar 5, 2026. Treat that date as your deadline.
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Free account, 1 product
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.
- CVSS
- 7.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Weakness (CWE)
- CWE-494
- Known exploited
- Added to CISA KEV Feb 12, 2026; federal remediation due Mar 5, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 1.77% (percentile 78)
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Mar 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
notepad-plus-plus notepad-plus-plus notepad_plus_plus:notepad_plus_plus (from the name) | before 8.8.9 | CNA record |
notepad-plus-plus notepad++ notepad-plus-plus:notepad++ | before 8.8.9 | NVD |
References
- https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fixrelease-notes, patch
- https://notepad-plus-plus.org/news/hijacked-incident-info-update/vendor-advisory, patch
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5abpatch
- https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdbpatch
- https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verificationthird-party-advisory
- https://notepad-plus-plus.org//news//clarification-security-incident/vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.