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

Quick assessment

Affected
notepad-plus-plus notepad-plus-plus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

notepad++是notepad++个人开发者开源的一款轻量级的代码与文本编辑工具。 Notepad++ 8.9.7之前版本存在路径遍历漏洞，该漏洞源于对session.xml中backupFilePath属性验证时未进行路径规范化，可能导致在快照模式恢复期间通过父目录序列读取备份目录之外的任意用户可读文件。

CVSS 5.1 · Medium EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1550 · Use Alternate Authentication Material

Affected Version Matrix 1

VendorProduct Version RangeStatus
notepad-plus-plus notepad-plus-plus < 8.9.7 affected
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I. Basic Information for CVE-2026-52886

Vulnerability Information
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Vulnerability Title
Notepad++: session.xml backupFilePath starts_with Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Notepad++ 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
notepad++是notepad++个人开发者开源的一款轻量级的代码与文本编辑工具。 Notepad++ 8.9.7之前版本存在路径遍历漏洞，该漏洞源于对session.xml中backupFilePath属性验证时未进行路径规范化，可能导致在快照模式恢复期间通过父目录序列读取备份目录之外的任意用户可读文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
notepad-plus-plus notepad-plus-plus < 8.9.7 -

II. Public POCs for CVE-2026-52886

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III. Intelligence Information for CVE-2026-52886

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Patches & Fixes for CVE-2026-52886 (1)

Vendor Advisories for CVE-2026-52886 (1)

Vendor Pages for CVE-2026-52886 (1)

Same Patch Batch · notepad-plus-plus · 2026-08-17 · 4 CVEs total

CVE-2026-57233 8.1 HIGH Notepad++: Path Traversal (Zip Slip) in WinGup Plugin Extraction
CVE-2026-54758 7.8 HIGH Notepad++: Stack Buffer Overflow in expandNppEnvironmentStrs
CVE-2026-71858 5.4 MEDIUM Notepad++: shortcuts.xml Macro HMAC Bypass Enables Conditional Elevated Command Execution

IV. Related Vulnerabilities

Same product: notepad-plus-plus
Same vendor: notepad-plus-plus
Same weakness: CWE-22

V. Comments for CVE-2026-52886

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