Note Mark: Path traversal via unsanitized book/note slug in migrate export (sibling of GHSA-g49p)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.6 · 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 · score source

EPSS

• CVE-2026-50553: 0.46% estimated exploitation activity in the next 30 days; percentile 39.80 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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 is the unguarded sibling of GHSA-g49p-4qxj-88v3 (CVE class…

Published by the source

9 Jul 2026, 13:41 UTC

Last modified by the source

9 Jul 2026, 13:41 UTC

Source last checked

26 Oct 2026, 15:24 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-rqrh-8wpv-x7hh

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# Patch Next advisory brief: CVE-2026-50553

Advisory: Note Mark: Path traversal via unsanitized book/note slug in migrate export (sibling of GHSA-g49p)
IDs: CVE-2026-50553, GHSA-rqrh-8wpv-x7hh
Record: https://patchnext.com/advisories/cve-2026-50553 (revision 1, source checked 26 Oct 2026, 15:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/enchant97/note-mark/backend 0.0.0-20260601210719-67b7de04308a. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/enchant97/note-mark/backend: affected < 0.0.0-20260601210719-67b7de04308a; fixed in 0.0.0-20260601210719-67b7de04308a

## Suggested inspection (read-only)
- Go github.com/enchant97/note-mark/backend: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/enchant97/note-mark/backend.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-rqrh-8wpv-x7hh (GitHub-reviewed advisory GHSA-rqrh-8wpv-x7hh lists affected ranges: Go github.com/enchant97/note-mark/backend >=0 <0.0.0-20260601210719-67b7de04308a)

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