---
cve: "CVE-2026-50553"
severity: "HIGH"
cvss: 8.6
epss: "0.4%"
vendor: "enchant97"
kev: false
exploited: false
published: "2026-09-04 18:17:52"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T01:15:59+02:00"
---

# CVE-2026-50553

> 8.6 HIGH · 🧪 PoC

## Beschreibung

Note Mark is an open-source note-taking application. Prior to version 0.19.5, Note Mark validates book and note slug values with the OpenAPI/huma tag pattern:"[a-z0-9-]+". huma compiles this with regexp.MustCompile(s.Pattern) and tests it with patternRe.MatchString(str), an UNANCHORED match. Because the pattern is not anchored (^...$), any string that merely CONTAINS one [a-z0-9-] substring passes validation. A slug such as ../../../../../../tmp/escape is accepted and stored verbatim. The data-export CLI commands (note-mark migrate export and note-mark migrate export-v1) join these unsanitized slugs straight into the output path with path.Join / filepath.Join, then os.MkdirAll the directory and os.Create the note file. path.Join resolves the ../ segments, so the note content file is written OUTSIDE the configured export directory. The export process commonly runs as root (default in Docker / bare-metal admin usage), so this is a root-privilege arbitrary directory create + file write. This issue has been patched in version 0.19.5.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |

## Patch verfügbar (OSV)

- 67b7de04308a858ef27ceff87b514067b6d667e5 (Commit)
- 7cdfd90f58dc9d15b9ca050971fd02ec93edf8e5 (Commit)

## Referenzen

- <https://github.com/enchant97/note-mark/security/advisories/GHSA-rqrh-8wpv-x7hh>
- <https://github.com/enchant97/note-mark/commit/67b7de04308a858ef27ceff87b514067b6d667e5>
- <https://github.com/enchant97/note-mark/releases/tag/v0.19.5>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-50553) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_