CVE-2026-18109Network attack vector

Stored XSS via unsafe LazyLoad img rewriting

Published Aug 14, 2026 · Updated Aug 14, 2026

Stored XSS in BoldGrid W3 Total Cache 2.10.3 and earlier allows remote attackers to run scripts through crafted comment author names. The LazyLoad mutator rewrites img tags containing the author name without limiting attribute matches to quoted values, causing unsafe markup to be re-emitted. Exploitation requires Lazy Load Images to be enabled and a user to open the injected page; the script runs in that visitor's browser.

CVSS severity7.2
High
EPSS probability0.27%
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 BoldGrid W3 Total Cache 2.10.3 and earlier allows remote attackers to run scripts through crafted comment author names. The LazyLoad mutator rewrites img tags containing the author name without limiting attribute matches to quoted values, causing unsafe markup to be re-emitted. Exploitation requires Lazy Load Images to be enabled and a user to open the injected page; the script runs in that visitor's browser.

The record

CVE
CVE-2026-18109
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
Web Ventures
Product
W3 Total Cache
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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 <=2.10.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Web Ventures · W3 Total Cacheversion=0 <=2.10.3

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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