CVE-2026-6427 json
a3 Lazy Load <= 2.7.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Video Element
published 2026-05-28 5 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-32733
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- a3rev a3 Lazy Load
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/5246efbb-93cc-4951-900e-d13d08840f03?source=cve
- plugins.trac.wordpress.org /browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L666
- plugins.trac.wordpress.org /browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L643
- plugins.trac.wordpress.org /browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L623
- plugins.trac.wordpress.org /browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L136
- plugins.trac.wordpress.org /browser/a3-lazy-load/trunk/classes/class-a3-lazy-load.php#L124
- plugins.trac.wordpress.org /browser/a3-lazy-load/trunk/admin/views/form-data.php#L11
- plugins.trac.wordpress.org /changeset?old_path=%2Fa3-lazy-load/tags/2.7.6&new_path=%2Fa3-lazy-load/tags/2.7.7
Sources
- CVE List CVE-2026-6427
- NVD CVE-2026-6427
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.