{"id":"CVE-2025-15556","kind":"vulnerability","aliases":["CVE-2025-15556"],"related":[],"title":"notepad-plus-plus notepad\\+\\+: Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification…","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.\n\nCISA 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.","summary":"Notepad++ updater (WinGUp) downloads update installers without verifying their integrity, so traffic can be intercepted or redirected. An attacker who controls that path can get a malicious installer run on the machine with the user's privileges.","severity":"high","cvss":7.7,"epss":null,"exploited":true,"exploited_at":"2026-02-12T00:00:00+00:00","products":[{"name":"Notepad++ Notepad++","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"notepad-plus-plus notepad\\+\\+","fixed":["8.8.9"],"affected":"< 8.8.9","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","notepad++","other","windows"],"not_affected_if":["unknown"],"how_to_check":null,"fix":"Apply the vendor mitigations per CISA guidance; the sources do not name a fixed version or specific setting. If no mitigation is available, stop using Notepad++.","status":"open","published_at":"2026-02-03T01:15:57+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:42:19+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-23T20:42:19Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigations per CISA guidance; the sources do not name a fixed version or specific setting. If no mitigation is available, stop using Notepad++.","reach":"network","summary":"Notepad++ updater (WinGUp) downloads update installers without verifying their integrity, so traffic can be intercepted or redirected. An attacker who controls that path can get a malicious installer run on the machine with the user's privileges.","category":"other","who_cares":["windows","notepad++"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker-controlled installer runs as the user, giving arbitrary code execution on the workstation.","analyst_note":"Find the vendor advisory and fixed Notepad++ version, plus the WinGUp update-verification change, via the CISA KEV entry for CVE-2025-15556.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000438,"input_tokens":2578,"output_tokens":360,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':135C '-15556':23A,26A '-2025':22A,25A '22':134C '8.8.9':10A 'action':125C 'allow':92C 'appli':126C 'applic':132C 'arbitrari':114C 'attack':56B,94C,107C 'attacker-control':106C 'bod':133C 'check':88C 'cisa':123C 'cloud':138C 'code':85C,115C 'contain':16A,81C 'control':58B,108C 'could':91C,111C 'cve':21A,24A 'discontinu':141C 'download':41B,83C,102C 'execut':104C,116C 'exploit':34B 'follow':131C 'get':62B 'guidanc':136C 'instal':43B,65B,109C 'instruct':130C 'integr':19A,47B,87C 'intercept':52B,96C 'lead':112C 'machin':69B 'malici':64B 'mitig':127C,147C 'notepad':2A,5A,6A,27A,28A,30A,33A,35B,38B,75C 'notepad-plus-plus':1A,29A 'path':60B 'per':128C 'plus':3A,4A,31A,32A 'prior':8A 'privileg':74B,119C 'product':145C 'redirect':54B,98C 'requir':124C 'run':66B 'servic':139C 'traffic':49B,100C 'unavail':149C 'updat':15A,18A,39B,42B,80C,99C 'use':12A,77C,142C 'user':72B,122C 'vendor':129C 'verif':20A 'verifi':45B 'version':7A 'vulner':89C 'window':37B 'wingup':14A,40B,79C 'without':44B,86C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-02-03T01:15:57+00:00","kev":{"dateAdded":"2026-02-12","dueDate":"2026-03-05","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_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","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-15556","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-15556","severity":null,"published_at":"2026-02-12T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T17:39:55+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-15556","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-15556","severity":null,"published_at":"2026-02-03T01:15:57+00:00","modified_at":"2026-06-17T08:38:01+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}