{"id":"CVE-2026-52886","summary":"Notepad++: session.xml backupFilePath starts_with Bypass","details":"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.","aliases":["GHSA-rqfm-pw34-r7j6"],"modified":"2026-09-11T08:19:24.339294Z","published":"2026-08-17T20:09:32.188Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-22"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52886.json"},"references":[{"type":"WEB","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52886.json"},{"type":"ADVISORY","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-rqfm-pw34-r7j6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52886"},{"type":"FIX","url":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/notepad-plus-plus/notepad-plus-plus","events":[{"introduced":"0"},{"fixed":"7e66f36db666a13b09fb5c31232ab2ca1c2ebccc"},{"fixed":"6634650414ff91220a4c353b7fe5ad741af0f9f9"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"8.9.7"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v8.9.6.4","v8.9.6.2","v8.9.6.1","v8.9.6","v8.9.5","v8.9.4","v8.9.3","v8.9.2","v8.9.1","v8.9","v8.8.9","v8.8.8","v8.8.7","v8.8.6","v8.8.5","v8.8.4","v8.8.3","v8.8.2","v8.8.1","v8.8","v8.7.9","v8.7.8","v8.7.7","v8.7.6","v8.7.5","v8.7.4","v8.7.3","v8.7.2","v8.7.1","v8.7","v8.6.9","v8.6.8","v8.6.7","v8.6.6","v8.6.5","v8.6.4","v8.6.3","v8.6.2","v8.6.1","v8.6","v8.5.8","v8.5.7","v8.5.6","v8.5.5","v8.5.4","v8.5.3","v8.5.2","v8.5.1","v8.5","v8.4.9","v8.4.8","v8.4.7","v8.4.6","v8.4.5","v8.4.4","v8.4.3","v8.4.2","v8.4.1","v8.4","v8.3.3","v8.3.2","v8.3.1","v8.3","v8.2.1","v8.2","v8.1.9.3","v8.1.9.2","v8.1.9.1","v8.1.9","v8.1.8","v8.1.7","v8.1.6","v8.1.5","v8.1.4","v8.1.3","v8.1.2","v8.1.1","v8.1","v8","v7.9.5","v7.9.4","v7.9.3","v7.9.2","v7.9.1","v7.9","v7.8.9","v7.8.8","v7.8.7","v7.8.6","v7.8.5","v7.8.4","v7.8.3","v7.8.2","v7.8.1","v7.8","v7.7.1","v7.7","v7.6.6","v7.6.5","v7.6.4","v7.6.3","v7.6.2","v7.6.1","v7.6","v7.5.9","v7.5.8","v7.5.7","v7.5.6","v7.5.5","v7.5.4","v7.5.3","v7.5.2","v7.5.1","v7.4.2","v7.4.1","v7.4","v7.3.3","v7.3.2","v7.3.1","7.3.1","v7.3","v7.2.2","7.2.2","v7.2.1","v7.2","v7.1","v7","v6.9.2","v6.9.1","v6.9","v6.8.9","v6.8.8","v6.8.7","v6.8.6","v6.8.5","v6.8.4","v6.8.3","v6.8.2","v6.8.1","v6.8","v6.7.9.2","v6.7.9.1","v6.7.9","v6.7.8.2","v6.7.8.1","v6.7.8","v6.7.7","v6.7.5","v6.7.4_-_Je_suis_Charlie_edition","v6.7.3","v6.7.2","v6.7.1","v6.7","v6.6.9","v6.6.8","v6.6.7","v6.6.6_-_Friday_the_13th_edition","v6.6.4","v6.6.3","v6.6.2","v6.6.1","v6.6","v6.5.5","v6.5.4","v6.5.3","v6.5.2","v6.5.1","v6.5","v6.4.5","v6.4.4","v6.4.3","v6.4.2","v6.4.1","v6.4","v6.3.3","v6.3.2","v6.3.1","v6.3","v6.2.3_-_End_of_World_Edition","v6.2.2","v6.2.1","v6.2","v6.1.8","v6.1.7","v6.1.6","v6.1.5","v6.1.4","v6.1.3","v6.1.2","v6.1.1","v6.1","v6","v5.9.8","v5.9.7","v5.9.6.2","v5.9.6.1","v5.9.6","v5.9.5","v5.9.4","v5.9.3","v5.9.2","v5.9.1","v5.9","v5.8.7","v5.8.6","v5.8.5","v5.8.4","v5.8.3","v5.8.2","v5.8.1","v5.8","v5.7","v5.6.8","v5.6.7","v5.6.6","v5.6.5","v5.6.4","v5.6.3","v5.6.2","v5.6.1","v5.6","v5.5.1","v5.5","v5.4.5","v5.4.4","v5.4.3","v5.4.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52886.json","vanir_signatures_modified":"2026-09-11T08:19:24Z","vanir_signatures":[{"id":"CVE-2026-52886-37fc05c0","signature_type":"Line","signature_version":"v1","source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc","target":{"file":"PowerEditor/src/Parameters.cpp"},"deprecated":false,"digest":{"line_hashes":["125086551666048332893396166433709575974","197454380087308052809824340913507577080","162740874957746219447733109533835835319","310153036149515223832662661769317652903","67370107506546072167298007906290293336","117440036000797918552134062783648197238","61322393409966154869913653700189900049","308614811163060984834273123717164695427","306554050350215031605204350278439567991","213525872368709099174499812450970749813","143694703225930165766555446214854749007","198894256613141137511103269672253497945","241897608214936184402853912300520175398","30016712392098672098310149226847510508","188839656448995255909661422048396188611","50206592733994361503178355877174674989","83503758164495065531992081966533721879","237023692041653281306064909820868561576","299300327002158385661628639636759465158","203062746188016324825868390406714599822","251310782762768289555157381769317444859","248976372372915337635209723111200711476","234073119568777317145818912969928629253"],"threshold":0.9}},{"signature_type":"Function","signature_version":"v1","source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc","target":{"file":"PowerEditor/src/Parameters.cpp","function":"NppParameters::getSessionFromXmlTree"},"deprecated":false,"digest":{"function_hash":"132311441769123653025704024015927114070","length":5508},"id":"CVE-2026-52886-3db864ea"},{"source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/6634650414ff91220a4c353b7fe5ad741af0f9f9","target":{"file":"PowerEditor/src/WinControls/AboutDlg/AboutDlg.cpp","function":"AboutDlg::run_dlgProc"},"deprecated":false,"digest":{"function_hash":"321789678466323583525587903832696399039","length":2313},"id":"CVE-2026-52886-77046d11","signature_type":"Function","signature_version":"v1"},{"digest":{"line_hashes":["73934179812655448165055737310699482624","165596075505432413455088505965299296812","15697846664367097651332048867224774793","327363084166932039838311470772824169691","27658911648692079515982892510481891031"],"threshold":0.9},"id":"CVE-2026-52886-de8dc4ca","signature_type":"Line","signature_version":"v1","source":"https://github.com/notepad-plus-plus/notepad-plus-plus/commit/6634650414ff91220a4c353b7fe5ad741af0f9f9","target":{"file":"PowerEditor/src/WinControls/AboutDlg/AboutDlg.cpp"},"deprecated":false}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}