WordPress Core <= 7.1 - Authenticated (Administrator+) Stored Cross-Site Scripting via Custom Header Image Data
WordPress Core is vulnerable to Stored Cross-Site Scripting via the custom header 'header_image_data' theme mod in various versions up to, and including, 7.1 due to insufficient sanitization of the header image width/height/URL values and an unescaped style attribute in the custom-header admin screen. get_custom_header() returned width/height without integer casting and Custom_Image_Header::step_1() echoed the style string without escaping. This makes it possible for authenticated attackers with edit_theme_options capability to inject web scripts; primarily relevant on Multisite where site administrators lack unfiltered_html.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress (core) | WordPress | <= 6.6.7, >= 6.7, <= 6.7.7, >= 6.8, <= 6.8.8, >= 6.9, <= 6.9.7, >= 7.0, <= 7.0.4, = 7.1 | 6.6.8, 6.7.8, 6.8.9, 6.9.8, 7.0.5, 7.1.1 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- WordPress
- Package
WordPress- Disclosed
- 17.09.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 3d59700b-3540-464c-bd27-23bb71f9b082 - Wordfence Intelligence
Copyright 2012-2026 Defiant Inc.
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Vulnerability history: WordPress
All published vulnerabilities of this package (WordPress (core)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 385
- First → latest
- 06.2003 10.2026
- Without a fix
- 0
- Exploited in attacks
- 3
Severity breakdown
- Critical 16
- High 95
- Medium 263
- Low 11
Disclosures per year
- 2017: 39
- 2018: 15
- 2019: 22
- 2020: 23
- 2021: 5
- 2022: 20
- 2023: 14
- 2024: 4
- 2025: 2
- 2026: 36
earlier: 205
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WordPress Core <= 7.1 - Authenticated (Administrator+) Stored Cross-Site Scripting via Custom Header Image Data this entry
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