CVE-2026-52886

Notepad++: session.xml backupFilePath starts_with Bypass

MEDIUM 5.1EPSS 0.2%

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: notepad-plus-plus
CVSS v4.0 GITHUB: 5.1 MEDIUMCVSS: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: 0.17% chance of exploitation in the next 30 days, 5th percentile
Published: 2026-08-17
Updated: 2026-08-18

Proof-of-concept exploits (1)

v3s9er/CVE-2026-528860★ · 2026-08-13

References

CVE Record
NVD entry

CVE-2026-52886

Proof-of-concept exploits (1)

References

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