Threat Intelligence / CVE / CVE-2025-56383

CVE-2025-56383

CVSS v3.1 8.4 (HIGH) · EPSS 0.2% (higher than 18.8% of all scored CVEs) · Priority 7/10 · Published 2025-09-26

As of 2026-02-26, CVE-2025-56383 is a HIGH-severity vulnerability, CVSS v3.1 8.4, EPSS 0.2% (18.8th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2025-56383, most recently “UAC-0099 Abuses Notepad++ Plugin Loading (CVE-2025-56383) to Deploy LunchPoke, BurnyBear, MatchBoil V2 Malware”.

Last updated: 2026-02-26

What is CVE-2025-56383?

Notepad++ v8.8.3 has a DLL hijacking vulnerability, which can replace the original DLL file to execute malicious code. NOTE: this is disputed by multiple parties because the behavior only occurs when a user installs the product into a directory tree that allows write access by arbitrary unprivileged users.

The record classifies CVE-2025-56383 under weakness class CWE-427. Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. The identifier was first published 359 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.4 — HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
0.2% probability of exploitation in the next 30 days, higher than 18.8% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2025-09-26, last modified 2026-02-26

Is CVE-2025-56383 being exploited?

Weaponised exploit code for CVE-2025-56383 is publicly available. 3 public proof-of-concept repositories are tracked for this identifier.

Affected products and versions

No affected-product or package list has been recorded for CVE-2025-56383 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

How to fix CVE-2025-56383

No vendor patch reference has been recorded for CVE-2025-56383 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

Threat activity tracking CVE-2025-56383

1 tracked threat in the Threadlinqs corpus references CVE-2025-56383, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Full detection coverage & IOCs for threats exploiting CVE-2025-56383 are available via the Threadlinqs MCP server (Purple tier). View plans →

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