CVE-2026-52886 - Notepad++: session.xml backupFilePath starts_with Bypass

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MEDIUM

Notepad++: session.xml backupFilePath starts_with Bypass

Published Aug 17, 2026

5.1

MEDIUM

CVSS 4.0

EPSS 0.17%

Description

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.

Affected products

Vendor Notepad-Plus-Plus Product Notepad-Plus-Plus Default
n/a
- Version
  < 8.9.7
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Notepad-Plus-Plus

n/a

Version	Status	Constraints
< 8.9.7	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-22

Path Traversal

References (4)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-60374
Advisory
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc
x_refsource_MISC
https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7
x_refsource_MISC
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-rqfm-pw34-r7j6
exploitx_refsource_CONFIRM

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-60374		Advisory
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc		x_refsource_MISC
https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7		x_refsource_MISC
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-rqfm-pw34-r7j6		exploitx_refsource_CONFIRM