CVE-2026-14287Network attack vector

Stored XSS via Critical CSS token bypass

Published Aug 19, 2026 · Updated Aug 19, 2026

Stored XSS in 10Web Booster before 2.33.5 allows remote attackers to execute JavaScript in visitors' browsers via crafted Critical CSS content. An unauthenticated request handler accepts a weakly validated access token and then renders attacker-supplied stylesheet content into the page head without escaping, turning stored CSS into executable markup. No account is required, but a victim must load an affected page; impact is limited to browser-side script execution against page visitors rather than direct server-side code execution.

CVSS severity4.7
Medium
EPSS probability0.17%
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 10Web Booster before 2.33.5 allows remote attackers to execute JavaScript in visitors' browsers via crafted Critical CSS content. An unauthenticated request handler accepts a weakly validated access token and then renders attacker-supplied stylesheet content into the page head without escaping, turning stored CSS into executable markup. No account is required, but a victim must load an affected page; impact is limited to browser-side script execution against page visitors rather than direct server-side code execution.

The record

CVE
CVE-2026-14287
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
10Web
Product
10Web Booster
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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 <2.33.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

10Web · 10Web Boosterversion=0 <2.33.5

Published CVSS scores

4.7CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/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

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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