# CVE-2026-17153: Missing authorization in AI Agent by SiteGround

> Authenticated contributors can bypass upload restrictions to upload arbitrary media files to the WordPress library via the AI Agent plugin.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:** 20 Aug 2026
- **Updated:** 20 Aug 2026
- **Also known as:** GHSA-qg2p-54pj-chvp

## What is CVE-2026-17153?

CVE-2026-17153 is a medium-severity missing authorization vulnerability in AI Agent by SiteGround, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The AI Agent by SiteGround plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.2.7. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to upload images to the WordPress media library, bypassing the upload_files capability restriction that Contributors are normally subject to, as authenticated attackers with Contributor-level access or above can satisfy the endpoint's nonce and permission checks. The sg_ai_studio_gutenberg_nonce required by the endpoint is emitted to any user with block editor access — including Contributors — making the absent upload_files check the sole barrier to exploitation.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-17153?


## How do I fix CVE-2026-17153?

No fix has been published for CVE-2026-17153 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-17153 being exploited?

There is no known exploitation of CVE-2026-17153 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-17153 and fix it if it is affected.

What it is: CVE-2026-17153 is a medium-severity missing authorization vulnerability in AI Agent by SiteGround, published on 20 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-2026-17153 in the wild and no public exploit code.

Affected product: AI Agent by SiteGround. 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-2026-17153/ (Markdown: https://insights.sbomify.com/CVE-2026-17153/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-17153
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-17153
- OSV: https://osv.dev/vulnerability/CVE-2026-17153

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-17153/
Summaries are generated and may contain mistakes; the official description above is the record.