CVE-2026-17153: Auth Bypass (CVSS 5.3)

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-862 Missing Authorization

References

Other References

https://plugins.trac.wordpress.org/browser/sg-ai-studio/tags/1.2.6/core/Helper/Helper.php#L1077 https://plugins.trac.wordpress.org/browser/sg-ai-studio/tags/1.2.6/core/Helper/Helper.php#L604 https://plugins.trac.wordpress.org/browser/sg-ai-studio/tags/1.2.6/core/Rest/Gutenberg.php#L118 https://plugins.trac.wordpress.org/browser/sg-ai-studio/tags/1.2.6/core/Rest/Rest.php#L325 https://plugins.trac.wordpress.org/browser/sg-ai-studio/tags/1.2.6/core/Rest/Rest.php#L474 https://plugins.trac.wordpress.org/changeset?reponame=&old=3654622%40sg-ai-studio&new=3654622%40sg-ai-studio https://www.wordfence.com/threat-intel/vulnerabilities/id/6280f40e-2998-43d4-a78f-b393e4f36df5?source=cve

Frequently Asked Questions

What is CVE-2026-17153? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-17153? +

CVE-2026-17153 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-17153? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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