Subscriber-level browser script execution
Published Aug 31, 2026 · Updated Sep 1, 2026
Cross-site scripting in The4 Kalles Addons 1.0.6 and earlier allows remote authenticated users to inject scripts into site pages. Patchstack has not disclosed the affected function, input field, or DOM operation that handles attacker-controlled content without adequate neutralization. Subscriber access is required, and exploitation requires another user to interact with the affected page, enabling script execution in that user's browser.
Summary
What happened
Cross-site scripting in The4 Kalles Addons 1.0.6 and earlier allows remote authenticated users to inject scripts into site pages. Patchstack has not disclosed the affected function, input field, or DOM operation that handles attacker-controlled content without adequate neutralization. Subscriber access is required, and exploitation requires another user to interact with the affected page, enabling script execution in that user's browser.
The record
- CVE
- CVE-2026-81778
- Published
- Aug 31, 2026
- Updated
- Sep 1, 2026
- Vendor
- The4
- Product
- Kalles Addons
- Classifications
- CWE-79, CAPEC-588, T1189
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 31, 2026CVE publishedPublication date reported by the CVE source.
- Sep 1, 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.
- Affected versionversion=n/a <=1.0.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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