# CVE-2026-13424: Cross-site scripting in Online Scheduling and Appointment Booking System – Bookly

> Unauthenticated attackers can inject arbitrary scripts via an AJAX action, leading to code execution when administrators view logs.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** GHSA-q2ch-2q4j-vq6h

## What is CVE-2026-13424?

CVE-2026-13424 is a high-severity cross-site scripting vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 16 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action in all versions up to, and including, 27.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injection point is the bookly_speed_up_update_addons AJAX action, which is registered as wp_ajax_nopriv_* and therefore reachable without authentication; the payload is stored verbatim in the bookly_log.details column when a request is submitted without a valid signature, and executes when an administrator later views the Diagnostics → Logs page.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-13424?


## How do I fix CVE-2026-13424?

No fix has been published for CVE-2026-13424 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13424 being exploited?

There is no known exploitation of CVE-2026-13424 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13424 and fix it if it is affected.

What it is: CVE-2026-13424 is a high-severity cross-site scripting vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 16 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-13424 in the wild and no public exploit code.

Affected product: ladela Online Scheduling and Appointment Booking System – Bookly. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-13424/ (Markdown: https://insights.sbomify.com/CVE-2026-13424/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13424
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13424
- OSV: https://osv.dev/vulnerability/CVE-2026-13424

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-13424/
Summaries are generated and may contain mistakes; the official description above is the record.