--- title: "CVE-2025-15556: Notepad++ < 8.8.9 WinGUp Updater Lacks… | CubePath" description: "Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification vulnerability where downloaded update metadata…" language: en source: https://cubepath.com/security/cve/CVE-2025-15556 --- # CVE-2025-15556: Notepad++ < 8.8.9 WinGUp Updater Lacks… | CubePath ## 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. Official description from the CVE record, published by VulnCheck. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-15556) ## Key data ### CVSS 4.0 High 7.7 Score published by VulnCheck in the CVE record. 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 | Metric | Value | What it means | | ----------------------------------- | ------- | -------------------------------------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | High | The attacker has to evade or get around security controls that are in place, which takes target-specific work. | | Attack requirements | None | The attack works without any special deployment or execution conditions. | | Privileges required | None | No account or privileges are needed. | | User interaction | Passive | A user takes part without meaning to, for example by loading a page. | | Vulnerable system: confidentiality | High | Serious or total effect on the secrecy of data. | | Vulnerable system: integrity | High | Serious or total effect on the trustworthiness of data. | | Vulnerable system: availability | High | Serious or total effect on availability. | | Subsequent systems: confidentiality | None | No effect on other systems' data secrecy. | | Subsequent systems: integrity | None | No effect on other systems' data trustworthiness. | | Subsequent systems: availability | None | No effect on other systems' availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.01746 (1.7% probability) Percentile 78.0% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Notepad++ Download of Code Without Integrity Check Vulnerability Added to the catalog Feb 12, 2026 Federal due date Mar 5, 2026 ### CISA assessment as of Feb 13, 2026 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable no Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-494](https://cwe.mitre.org/data/definitions/494.html) Download of Code Without Integrity Check ## Affected products Products listed in the CVE record, as the CNA published them. - notepad-plus-plus - affected: before 8.8.9 ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-…](https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix) release-notes patch - [notepad-plus-plus.org/news/hijacked-incident-info-update](https://notepad-plus-plus.org/news/hijacked-incident-info-update/) vendor-advisory - [github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2a…](https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab) patch - [github.com/notepad-plus-plus/wingup/commit/ce0037549995ed03…](https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb) patch - [vulncheck.com/advisories/notepad-plus-plus-wingup-updater-l…](https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification) third-party-advisory ## Timeline 1. ID reserved Feb 2, 2026 2. Record published Feb 3, 2026 3. Added to CISA KEV Feb 12, 2026 4. Record last updated Mar 5, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:05 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)