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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-17153 being exploited?
There is no known exploitation of CVE-2026-17153 in the wild and no public exploit code.
Sources
Also known as GHSA-qg2p-54pj-chvp.