# CVE-2026-52838: Easy!Appointments disable_booking_message rendered as raw HTML on public booking page — Stored XSS

> An authenticated administrator can inject malicious scripts into the disabled booking message, leading to stored XSS for all visitors on the public booking page.

- **Severity:** Low 2.6 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Jul 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-996f-334j-67g7

## What is CVE-2026-52838?

CVE-2026-52838 is a low-severity cross-site scripting vulnerability in alextselegidis easyappointments, published on 14 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 allow administrators to define a custom "booking disabled" message through the booking settings page. That value is stored in the `disable_booking_message` setting via a rich-text editor and later passed directly to the public `booking_message` view without escaping or sanitization. An authenticated administrator can store HTML or JavaScript in this field, enable disabled-booking mode, and trigger stored XSS in every unauthenticated visitor who opens the public booking page. Version 1.6.0 fixes the issue.

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

## Which versions are affected by CVE-2026-52838?

2 open source packages ship an affected version, including alextselegidis/easyappointments.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `alextselegidis/easyappointments` | Packagist | All versions to 1.5.2 | None |
| `alextselegidis/easyappointments` | Packagist | All versions to 1.5.2 | None |

## How do I fix CVE-2026-52838?

No fix has been published for CVE-2026-52838 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-52838 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52838 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-52838 and fix it if it is affected.

What it is: CVE-2026-52838 is a low-severity cross-site scripting vulnerability in alextselegidis easyappointments, published on 14 Jul 2026. An attacker needs administrator access to exploit it, 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-2026-52838 exists.

Affected packages and fixed versions:
- alextselegidis/easyappointments (Packagist): affected all versions up to 1.5.2; no fix listed
- alextselegidis/easyappointments (Packagist): affected all versions up to 1.5.2; no fix listed

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-2026-52838/ (Markdown: https://insights.sbomify.com/CVE-2026-52838/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-52838
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-52838
- OSV: https://osv.dev/vulnerability/CVE-2026-52838

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-52838/
Summaries are generated and may contain mistakes; the official description above is the record.