# CVE-2026-88793: YouTube Embed 10.0 - 10.3 - Unauthenticated Stored XSS via youram_server

> Unauthenticated attackers can inject malicious scripts via AJAX actions, leading to session hijacking or code execution in admin sessions.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-mwfg-r67v-rvfv

## What is CVE-2026-88793?

CVE-2026-88793 is a high-severity cross-site scripting vulnerability in Unknown YouTube Embed, published on 13 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The YouTube Embed WordPress plugin from 10.0 to 10.3 does not perform any authorisation check on one of its AJAX actions, relying only on a nonce it prints on every front-end page, and does not escape the stored data before rendering it, allowing unauthenticated attackers to store arbitrary web scripts which will execute in the session of any user viewing the affected content, including an administrator.

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

## Which versions are affected by CVE-2026-88793?


## How do I fix CVE-2026-88793?

No fix has been published for CVE-2026-88793 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-88793 being exploited?

There is no known exploitation of CVE-2026-88793 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88793 and fix it if it is affected.

What it is: CVE-2026-88793 is a high-severity cross-site scripting vulnerability in Unknown YouTube Embed, published on 13 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-88793 in the wild and no public exploit code.

Affected product: Unknown YouTube Embed. 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-2026-88793/ (Markdown: https://insights.sbomify.com/CVE-2026-88793/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88793
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88793
- OSV: https://osv.dev/vulnerability/CVE-2026-88793

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-88793/
Summaries are generated and may contain mistakes; the official description above is the record.