a3 Lazy Load <= 2.7.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Video Element
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The a3 Lazy Load plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.7.6 This is due to a regex bug in the _filter_videos() method that breaks HTML attribute quoting when processing crafted <video> elements, combined with unescaped output in the admin/views/form-data.php template. An authenticated attacker with Contributor-level access can insert a crafted <video> tag whose src attribute contains an embedded class=" substring that tricks the plugin's class-replacement regex into consuming an attribute-value closing quote. This shifts the HTML5 parser's quote boundary, promoting attacker-controlled text from inside a quoted attribute value into standalone event-handler attributes (autofocus, onfocus). The injected script executes in the browser of any user (including administrators) who views the post.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-6427
- 2026-10-03 Alias added: GHSA-xgw3-j63x-rv92
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/5246efbb-93cc-4951-900e-d13d08840f03?source=cve
- https://plugins.trac.wordpress.org/browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L666
- https://plugins.trac.wordpress.org/browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L643
- https://plugins.trac.wordpress.org/browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L623
- https://plugins.trac.wordpress.org/browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L136
- https://plugins.trac.wordpress.org/browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L124
- https://plugins.trac.wordpress.org/browser/a3-lazy-load/trunk/admin/views/form-data.php#L11
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fa3-lazy-load/tags/2.7.6&new_path=%2Fa3-lazy-load/tags/2.7.7
More a3rev vulnerabilities
- TI-2023-00091 Page View Count < 2.6.1 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
- TI-2022-00358 Page Views Count < 2.4.15 - Unauthenticated SQL Injection CVSS 3.1CRITICAL 9.8
- TI-2024-11423 Compare Products for WooCommerce <= 3.2.1 - Unauthenticated PHP Object Injection CVSS 3.1HIGH 8.1
- TI-2025-02460 Page View Count 2.8.0 - 2.8.4 - Missing Authorization to Authenticated (Subscriber+) Limited Options Update CVSS 3.1HIGH 8.1
- TI-2024-01683 Product Sort and Display for WooCommerce <= 2.4.1 - Missing Authorization CVSS 3.1MEDIUM 6.5
- TI-2024-25904 WordPress Predictive Search for WooCommerce plugin <= 6.0.1 - Reflected Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
Sources
- CVE-2026-6427 · CVE Program
- CVE-2026-6427 · NVD
- FIRST EPSS
- GHSA-xgw3-j63x-rv92 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences