CVE-2025-15556 (GCVE-0-2025-15556)
Vulnerability from cvelistv5 – Published: 2026-02-03 00:50 – Updated: 2026-03-05 01:29 X_Known Exploited VulnerabilityTitle
Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification
Summary
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
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-13 04:56 UTC
CWE
- CWE-494 - Download of Code Without Integrity Check
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://community.notepad-plus-plus.org/topic/272… | release-notespatch |
| https://notepad-plus-plus.org/news/hijacked-incid… | vendor-advisory |
| https://github.com/notepad-plus-plus/notepad-plus… | patch |
| https://github.com/notepad-plus-plus/wingup/commi… | patch |
| https://www.vulncheck.com/advisories/notepad-plus… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
| https://notepad-plus-plus.org//news//clarificatio… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| notepad-plus-plus | notepad-plus-plus |
Affected:
0 , < 8.8.9
(semver)
cpe:2.3:a:notepad_plus_plus:notepad\+\+:*:*:*:*:*:*:*:* |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4e3b6370-7bc8-4fed-b693-bf22ab520644
Exploited: Yes
Timestamps
First Seen: 2026-02-12
Asserted: 2026-02-12
Scope
Notes: KEV entry: Notepad++ Download of Code Without Integrity Check Vulnerability | Affected: Notepad++ / Notepad++ | 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. | 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. | Due date: 2026-03-05 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://notepad-plus-plus.org/news/clarification-security-incident/ ; https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix ; https://nvd.nist.gov/vuln/detail/CVE-2025-15556
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-494 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Notepad++ |
| Due Date | 2026-03-05 |
| Date Added | 2026-02-12 |
| Vendorproject | Notepad++ |
| Vulnerabilityname | Notepad++ Download of Code Without Integrity Check Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-13 07:17 UTC
| Updated: 2026-02-13 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6330fb64-1290-4e90-8656-09d443a10efd
Exploited: Yes
Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification | Affected: notepad-plus-plus / notepad-plus-plus | CVSS: 7.7 (HIGH) | EPSS: 0.01268 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification |
| Vendor | notepad-plus-plus |
| Product | notepad-plus-plus |
| Added Date | 2026-06-01T10:50:56.130Z |
| Cvss Score | 7.7 |
| Epss Score | 0.01268 |
| Cvss Severity | HIGH |
| Epss Percentile | 0.65936 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev |
|
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:03 UTC
| Updated: 2026-07-10 06:14 UTC
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}
],
"value": "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."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "HIGH",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "HIGH",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-494",
"description": "CWE-494 Download of Code Without Integrity Check",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-05T01:29:51.538Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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},
"references": [
{
"tags": [
"release-notes",
"patch"
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"url": "https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://notepad-plus-plus.org/news/hijacked-incident-info-update/"
},
{
"tags": [
"patch"
],
"url": "https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab"
},
{
"tags": [
"patch"
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"url": "https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb"
},
{
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification"
}
],
"source": {
"discovery": "UNKNOWN"
},
"tags": [
"x_known-exploited-vulnerability"
],
"timeline": [
{
"lang": "en",
"time": "2025-12-09T17:41:00.000Z",
"value": "Vulnerability is publicly disclosed"
},
{
"lang": "en",
"time": "2026-02-02T17:00:00.000Z",
"value": "Announcement of exploitation in the wild"
}
],
"title": "Notepad++ \u003c 8.8.9 WinGUp Updater Lacks Update Integrity Verification",
"x_generator": {
"engine": "Vulnogram 0.5.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2025-15556",
"datePublished": "2026-02-03T00:50:29.516Z",
"dateReserved": "2026-02-02T22:25:12.781Z",
"dateUpdated": "2026-03-05T01:29:51.538Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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