CVE-2026-52886CWE-22path-traversal

CVE-2026-52886

published August 18, 2026

CVSS
5.1
EPSS
0%
Percentile
5.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
5.1 · NONE
CVSS v4.0
5.1 · 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
EPSS
0.00165 · 5.5th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-08-18T00:16Z
References (4)
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc · [email protected]https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7 · [email protected]https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-rqfm-pw34-r7j6 · [email protected]https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-rqfm-pw34-r7j6 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 AUG 20:09Z
    Notepad++: session.xml backupFilePath starts_with Bypass
    cvelistv5