high Known exploitedREV. 01
CVE-2025-15556Notepad++ — updater installs without an integrity check
Notepad++ before 8.8.9 accepts update metadata and installers from its updater without confirming they are genuine, so anyone able to redirect the update traffic gets their own installer run with the user's privileges.
Read the risk
THE VITAL STATS- CVSS score
- 7.5/ 10 CVSS v3.1
- EPSS probability
- 2% Likelihood of exploitation
- Attack complexity
- High Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-02-03
- Added to KEV
- 2026-02-12
- Exploit published
- Not recorded
- Confidence
- high
- Kill chain
- initial access
- MITRE ATT&CK
- —
- Severity
- high
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Attacker needsA position from which the attacker can intercept or redirect the updater's traffic.
Fixed inNotepad++ 8.8.9
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorygithub.comgithub.com
- 04Vendor advisorygithub.comgithub.com
- 05Vendor advisorynotepad-plus-plus.orgnotepad-plus-plus.org
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.