CVE-2026-22810 — Joplin: Path traversal in OneNote importer allows overwriting arbitrary files
Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Versions prior to 3.5.7 contain a path traversal vulnerability in the importer which allows overwriting arbitrary files on disk. 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. This issue has been patched in version 3.5.7.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.2% (30-day exploitation probability)+1
- Technical severity (high)+6
- CISA SSVC: exploitation "poc"+5
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — github.com (NIST National Vulnerability Database)
- Documented patch — github.com (NIST National Vulnerability Database)
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Joplinapp Joplin, Laurent22 Joplin, Msiemens One2html).
- Apply the fixed version or the patch documented under Remediation.
- Exploitation requires user interaction: tighten email/web filtering and warn affected users.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 8.2 | CVSS 3.1 | High | 1.5 | 6.0 | security-advisories@github.com via NIST National Vulnerability Database |
| 8.2 | CVSS 3.1 | High | — | — | GitHub_M via CVE Program (cve.org) e CISA ADP |
| 7.3 | CVSS 3.1 | High | 1.3 | 5.9 | nvd@nist.gov via NIST National Vulnerability Database |
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.21%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · laurent22/joplin
- SSVC assessment updated
- Record published
- Fix documented
- CVSS changed · 7.3
- Source status changed · → Analyzed
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
5 on the record
- github.com/laurent22/joplin/security/advisories/GHSA-gcmj-c9gg-9vh6
- github.com/laurent22/joplin/releases/tag/v3.5.7
- github.com/laurent22/joplin/commit/791668455e1aae50501ff57ea4783b3fba9d377c
- github.com/laurent22/joplin/pull/13736
- github.com/laurent22/joplin/blob/af5108d70233b1db9410346958c1587cf7c1b16d/packag
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-105785 Joplin Server password reset accepts tokens issued for unrelated purposes 9d
- High CVE-2026-105786 Joplin: Unauthenticated account takeover via an attacker-chosen application-authorisation identifier 9d
- High CVE-2026-105783 Joplin Web Clipper pairing allows cross-origin theft of a permanent API token 9d
- Medium CVE-2026-105784 Joplin whiteboard card rendering allows CSS injection into application chrome 9d
- Medium CVE-2026-34600 Joplin Server delta API returns note content after share access is revoked May 19, 2026
- Medium CVE-2025-57798 Joplin has Denial of Service (DoS) via Uncontrolled Resource Allocation through Title Input May 19, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-22810 is "Joplin: Path traversal in OneNote importer allows overwriting arbitrary files", rated High. It affects Joplin (Joplinapp); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.3 describes technical severity. EPSS 0.21% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
Comments
Moderated technical discussion. Read the community guidelines.
No comments yet.
Sign in or create an account to comment and suggest corrections.