CVE-2026-17153 json
AI Agent by SiteGround <= 1.2.7 - Missing Authorization to Authenticated (Contributor+) Arbitrary Media Upload via /generate-content REST Endpoint
published 2026-08-20 2 mo ago modified 2026-08-20 2 mo ago also EUVD-2026-63200
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected products
- siteground AI Agent by SiteGround
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/6280f40e-2998-43d4-a78f-b393e4f36df5?source=cve
- plugins.trac.wordpress.org /browser/sg-ai-studio/tags/1.2.6/core/Rest/Rest.php#L474
- plugins.trac.wordpress.org /browser/sg-ai-studio/tags/1.2.6/core/Rest/Rest.php#L325
- plugins.trac.wordpress.org /browser/sg-ai-studio/tags/1.2.6/core/Helper/Helper.php#L1077
- plugins.trac.wordpress.org /browser/sg-ai-studio/tags/1.2.6/core/Helper/Helper.php#L604
- plugins.trac.wordpress.org /browser/sg-ai-studio/tags/1.2.6/core/Rest/Gutenberg.php#L118
- plugins.trac.wordpress.org /changeset?reponame=&old=3654622%40sg-ai-studio&new=3654622%40sg-ai-studio
Sources
- CVE List CVE-2026-17153
- NVD CVE-2026-17153
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.