CVE-2026-17153Network attack vectorHinoki check available

Contributor media upload via omitted capability check

Published Aug 20, 2026 · Updated Aug 20, 2026

Authorization bypass in AI Agent by SiteGround before 1.2.8 allows remote authenticated users to upload media via the REST API. The /generate-content REST endpoint accepts an sg_ai_studio_gutenberg_nonce available to block-editor users but does not verify the upload_files capability before writing generated images into the WordPress media library. Contributor-level access or higher is enough because those users can obtain the nonce; the published impact is limited to unauthorized media-library writes.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in AI Agent by SiteGround before 1.2.8 allows remote authenticated users to upload media via the REST API. The /generate-content REST endpoint accepts an sg_ai_studio_gutenberg_nonce available to block-editor users but does not verify the upload_files capability before writing generated images into the WordPress media library. Contributor-level access or higher is enough because those users can obtain the nonce; the published impact is limited to unauthorized media-library writes.

The record

CVE
CVE-2026-17153
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
SiteGround
Product
AI Agent by SiteGround
Classifications
CWE-862
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiteGround · AI Agent by SiteGroundversion=0 <=1.2.7

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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