Quick answers
- Is CVE-2026-17153 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-17153 being exploited in the wild.
- How severe is CVE-2026-17153?
- Medium severity, with a CVSS score of 5.3, published 20 August 2026.
- Which products and versions are affected?
- SiteGround AI Agent up to 1.2.7.
- Is there a fix for CVE-2026-17153?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-17153 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-17153?
- Check whether you run SiteGround AI Agent at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an authorization bypass in the AI Agent plugin affecting versions up to 1.2.7. The vulnerable endpoint fails to check the upload_files capability when processing file uploads; instead, it only validates the sg_ai_studio_gutenberg_nonce security token, which is issued to any user with block editor access (including Contributors). An authenticated attacker with Contributor-level or higher privileges can satisfy both the nonce and permission checks despite lacking upload_files capability, allowing unauthorized media library uploads. The root cause is the absence of a capability check before file upload processing. No authentication is required for unauthenticated exploitation if the nonce can be obtained, though the advisory indicates authenticated Contributor access is the primary attack vector. A patch addressing this authorization bypass has likely been released in version 1.2.8 or later.
Affected products
- SiteGround AI Agent up to 1.2.7
Timeline
- 2026-08-20: disclosed