Vulnerability in @joplin/onenote-converter (CVE-2026-22810)
Summary
Vulnerability in @joplin/onenote-converter (CVE-2026-22810). Successful exploitation can lead to full system takeover. Exploitable via embedded_file.rs. Mitigation: upgrade to 3.5.7 or later.
Original description
The description as published by the source.
Summary
A path traversal vulnerability in the OneNote importer allows overwriting arbitrary files on disk.
Details
The OneNote converter does not sanitize the names of embedded files before writing them to disk. As a result, it's possible for an attacker to create a malicious .one file that includes file names containing ../../, that are then interpreted as part of the target path when extracting attachments from the .one file.
One affected location is embedded_file.rs, which generates a file name from a string previously parsed from the .one file,
https://github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packages/onenote-converter/renderer/src/page/embedded_file.rs#L13-L16
Above, determine_filename passes through the provided file name.
Similar logic has been present since 4d7fa5972fe2986eae14cbf3a2801835cbe1384e (Joplin 3.2.2), when the OneNote importer was first introduced.
PoC
Screencast from 2025-11-20 13-50-21.webm
- Import poc_v2.zip.
- Open the application's profile directory…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-22810 has been found in @joplin/onenote-converter.
Attackers can target a specific entry point like embedded_file.rs over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.2/10.
What to do: upgrade @joplin/onenote-converter to 3.5.7 or later.
If unsure, ask your IT team or search "@joplin/onenote-converter CVE-2026-22810" on the vendor's site.
CVE-2026-22810 (@joplin/onenote-converter) — CWE-24 / CVSS v3 8.2
Attack vector: local
Attack surface: embedded_file.rs / determine_filename / log.txt
Patched: 3.5.7 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-24) exists in @joplin/onenote-converter. Attackers reach the vulnerable code path via embedded_file.rs.
Check the vendor advisory for the affected versions of @joplin/onenote-converter. Attack surface: embedded_file.rs / determine_filename / log.txt.
Severity: High (CVSS 8.2/10). Successful exploitation can lead to full system takeover.
Update to 3.5.7.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@joplin/onenote-converter' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@joplin/onenote-converter' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@joplin/onenote-converterを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @joplin/onenote-converter to 3.5.7ステージング環境で 3.5.7 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- issue security-advisories@github.com
- package github.com
- patch github.com
- patch security-advisories@github.com
- patch security-advisories@github.com
- web security-advisories@github.com
- web github.com