CVE-2026-52886
Notepad++: session.xml backupFilePath starts_with Bypass
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-22 |
| Vendor | notepad-plus-plus |
| Product | notepad-plus-plus |
| Published | Aug 17, 2026 |
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Affected Versions
notepad-plus-plus / notepad-plus-plus
< 8.9.7
References
github.com: https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-rqfm-pw34-r7j6 github.com: https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc github.com: https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7