CVE-2026-52886

Notepad++: session.xml backupFilePath starts_with Bypass

Published: Aug 17, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-22

N/ACVSS

NVD MITRE

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.

No summary for this CVE yet.

Weaknesses

CWE-22

Affected Products

notepad-plus-plus

commercialaka notepad plus plus, notepad+ plus, notepad++

notepad-plus-plusOn-prem

Consumer Software / productivity

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

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

github.com

News mentions

⚡ Weekly Recap: Rogue AI Models, $88M Bitcoin Theft, Water-System Attacks and Dangling DNS Hijacks
en·The Hacker News·Aug 3, 2026 Exploited Coldcard Wallet Laundry Bear

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