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Tool Directory

CVE-2026-52886

MediumPublished

Notepad++: session.xml backupFilePath starts_with Bypass

Published: Aug 17, 2026
Updated: Aug 18, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 19, 2026

Primary CVSS

5.1/ 10Medium

nvd · CVSS 4.0

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 15.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, Notepad++ validates the backupFilePath attribute from session.xml with std::wstring::starts_with against the expected backup directory without path normalization, allowing parent-directory sequences during snapshot-mode restoration to read an arbitrary user-readable file outside the backup directory into an editor tab. This issue is fixed in version 8.9.7.

Sources

CVE-2026-52886PoC
Notepad++ CVE-2026-52886 — session.xml backupFilePath starts_with() path traversal (GHSA-rqfm-pw34-r7j6)

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