# CVE-2026-16063: Event Booking Manager for WooCommerce < 5.3.7 - Author+ Stored XSS via Event Timeline Content

> Authors can inject JavaScript into event timelines, executing code in visitors' browsers, including administrators, via the Event Booking Manager plugin.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 2 Aug 2026
- **Updated:** 3 Aug 2026
- **Also known as:** GHSA-c58x-hvfg-9vjh

## What is CVE-2026-16063?

CVE-2026-16063 is a medium-severity cross-site scripting vulnerability in Unknown Event Booking Manager for WooCommerce, published on 2 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The Event Booking Manager for WooCommerce  WordPress plugin before 5.3.7 does not sanitise or escape event timeline content submitted by users with post-editing access before storing it and rendering it on the public event page, allowing users with the Author role and above to inject arbitrary JavaScript that executes in the browser of any visitor viewing the event, including administrators.

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

## Which versions are affected by CVE-2026-16063?


## How do I fix CVE-2026-16063?

No fix has been published for CVE-2026-16063 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-16063 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16063 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-16063 and fix it if it is affected.

What it is: CVE-2026-16063 is a medium-severity cross-site scripting vulnerability in Unknown Event Booking Manager for WooCommerce, published on 2 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16063 exists.

Affected product: Unknown Event Booking Manager for WooCommerce. 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-2026-16063/ (Markdown: https://insights.sbomify.com/CVE-2026-16063/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-16063
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-16063
- OSV: https://osv.dev/vulnerability/CVE-2026-16063

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-16063/
Summaries are generated and may contain mistakes; the official description above is the record.