CVE-2026-6427Network attack vector

Stored XSS via broken video attribute quoting

Published May 28, 2026 · Updated May 28, 2026

Stored XSS in a3 Lazy Load 2.7.6 and earlier allows remote authenticated users to execute script through crafted video markup. The _filter_videos() method uses a class-replacement regex that consumes a closing quote in a crafted video src value, while admin/views/form-data.php outputs the result without escaping. Contributor-level access is required to store the payload, which runs in the browser of any user, including an administrator, who views the post.

CVSS severity6.4
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in a3 Lazy Load 2.7.6 and earlier allows remote authenticated users to execute script through crafted video markup. The _filter_videos() method uses a class-replacement regex that consumes a closing quote in a crafted video src value, while admin/views/form-data.php outputs the result without escaping. Contributor-level access is required to store the payload, which runs in the browser of any user, including an administrator, who views the post.

The record

CVE
CVE-2026-6427
Published
May 28, 2026
Updated
May 28, 2026
Vendor
a3rev Software
Product
a3 Lazy Load
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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 <=2.7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

a3rev Software · a3 Lazy Loadversion=0 <=2.7.6

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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