CVE-2025-15556
Confirmed PUBLISHEDNotepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification
1 day faster than CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Feb 03, 2026
- Exploitation Reported
- Jun 01, 2026
- CVSS
- 7.7 High
- EPSS
- 1.3%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| notepad-plus-plus |
notepad-plus-plus
|
0 to < 8.8.9 |
Affected |
CVE References
- Vendor Advisory — notepad-plus-plus.org notepad-plus-plus.org · Vendor Advisory https://notepad-plus-plus.org/news/hijacked-incident-info-update/
- Patch — community.notepad-plus-plus.org community.notepad-plus-plus.org · Patch https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vu...
- GitHub — notepad-plus-plus/notepad-plus-plus github.com · Patch https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa6...
- GitHub — notepad-plus-plus/wingup github.com · Patch https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396...
- Third-Party Advisory — vulncheck.com vulncheck.com · Third-Party Advisory https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2026-06-01 10:50 UTC |
| CISA | 2026-06-02 14:03 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-06-01 10:50:56 UTC · CVE
Weaknesses (CWE)
-
Download of Code Without Integrity Check
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
14:03 UTC about 2 months ago14:03 UTC · about 2 months ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
10:50 UTC about 2 months ago10:50 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
00:50 UTC 6 months ago00:50 UTC · 6 months ago
CVE published
Vulnerability disclosed publicly
-
22:25 UTC 6 months ago22:25 UTC · 6 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2025-15556
{
"cve_id": "CVE-2025-15556",
"title": "Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification",
"affected_vendor": "notepad-plus-plus",
"affected_product": "notepad-plus-plus",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 7.7,
"epss_score": 0.01268,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}