CVE-2026-19760Network attack vectorHinoki check available

Stored XSS via cached Host-header script URL

Published Aug 26, 2026 · Updated Aug 26, 2026

Stored cross-site scripting in Emre Vona WP Fastest Cache 1.5.0 and earlier allows remote attackers to inject scripts via the HTTP Host header. With Polylang active and Combine JS enabled, the plugin converts the unvalidated Host value into a script src URL and stores it in the shared page-cache file. Any subsequent visitor who loads the poisoned cached page executes the script in the site's origin, allowing browser-session data access or actions as that visitor.

CVSS severity7.2
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored cross-site scripting in Emre Vona WP Fastest Cache 1.5.0 and earlier allows remote attackers to inject scripts via the HTTP Host header. With Polylang active and Combine JS enabled, the plugin converts the unvalidated Host value into a script src URL and stores it in the shared page-cache file. Any subsequent visitor who loads the poisoned cached page executes the script in the site's origin, allowing browser-session data access or actions as that visitor.

The record

CVE
CVE-2026-19760
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
Emre Vona
Product
WP Fastest Cache
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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 <=1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Emre Vona · WP Fastest Cacheversion=0 <=1.5.0

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1190Exploit Public-Facing Application

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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