{"id":"CVE-2025-15556","aliases":["EUVD-2025-206661","GHSA-cqx4-h5ph-3xj9"],"status":"published","title":"Notepad++ \u003c 8.8.9 WinGUp Updater Lacks Update Integrity Verification","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.","severity":{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01746,"percentile":0.78133,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-494"],"published":"2026-02-03T00:50:29Z","modified":"2026-10-28T10:45:11Z","kev":{"date_added":"2026-02-12","due_date":"2026-03-05","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-02-12"},{"source":"kev","since":"2026-02-12"}],"exploits":[{"source":"pocgithub","id":"renat0z3r0/notepadpp-supply-chain-iocs","title":"renat0z3r0/notepadpp-supply-chain-iocs","date":"2026-02-09","url":"https://github.com/renat0z3r0/notepadpp-supply-chain-iocs"},{"source":"pocgithub","id":"George0Papasotiriou/CVE-2025-15556-Notepad-WinGUp-Updater-RCE","title":"George0Papasotiriou/CVE-2025-15556-Notepad-WinGUp-Updater-RCE","date":"2026-02-10","url":"https://github.com/George0Papasotiriou/CVE-2025-15556-Notepad-WinGUp-Updater-RCE"}],"products":[{"vendor":"notepad++","product":"notepad++"},{"vendor":"notepad-plus-plus","product":"notepad-plus-plus"},{"vendor":"notepad-plus-plus","product":"notepad\\+\\+"}],"references":[{"url":"https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix","tags":["release-notes","patch","Release Notes","fix"]},{"url":"https://notepad-plus-plus.org/news/hijacked-incident-info-update/","tags":["vendor-advisory","Patch","Vendor Advisory","advisory"]},{"url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab","tags":["patch","Patch","fix"]},{"url":"https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb","tags":["patch","Patch","fix"]},{"url":"https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification","tags":["third-party-advisory","Third Party Advisory","advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556","tags":["government-resource","US Government Resource","web"]},{"url":"https://notepad-plus-plus.org//news//clarification-security-incident/","tags":["third-party-advisory","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-15556","tags":["advisory"]},{"url":"https://notepad-plus-plus.org/news/hijacked-incident-info-update"},{"url":"https://notepad-plus-plus.org//news//clarification-security-incident"},{"url":"https://github.com/advisories/GHSA-cqx4-h5ph-3xj9"},{"url":"https://github.com/notepad-plus-plus","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/15xxx/CVE-2025-15556.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-15556","title":"Notepad++ \u003c 8.8.9 WinGUp Updater Lacks Update Integrity Verification","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.","status":"published","published":"2026-02-03T00:50:29.516Z","modified":"2026-03-05T01:29:51.538Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-494"],"updated_at":"2026-11-02T14:32:37.351404Z"}],"euvd":[{"id":"EUVD-2025-206661","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.","status":"published","published":"2026-02-03T00:50:29Z","modified":"2026-03-05T01:29:51Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"exploited_since":"2026-02-12","updated_at":"2026-11-02T19:48:09.383214Z"}],"ghsa":[{"id":"GHSA-cqx4-h5ph-3xj9","title":"Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity...","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.","status":"published","published":"2026-02-03T03:30:26Z","modified":"2026-02-13T15:30:24Z","cvss":[{"version":"4.0","score":7.7,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-494"],"updated_at":"2026-11-02T15:06:11.78432Z"}],"kev":[{"id":"CVE-2025-15556","title":"Notepad++ Download of Code Without Integrity Check Vulnerability","description":"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.","cwes":["CWE-494"],"kev":{"date_added":"2026-02-12","due_date":"2026-03-05","required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"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.","status":"published","published":"2026-02-03T01:15:57.757Z","modified":"2026-06-17T08:38:01.047Z","cvss":[{"version":"4.0","score":7.7,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-494"],"updated_at":"2026-11-02T14:11:59.832225Z"}],"osv":[{"id":"CVE-2025-15556","title":"Notepad++ \u003c 8.8.9 WinGUp Updater Lacks Update Integrity Verification","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.","status":"published","published":"2026-02-03T00:50:29.516Z","modified":"2026-10-28T10:45:11.470378527Z","cvss":[{"version":"4.0","score":7.7,"vector":"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","level":"high"}],"cwes":["CWE-494"],"updated_at":"2026-11-02T15:44:46.340268Z"}]}}