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CVE-2026-108566— InstantSoft icms2 Private Message index.tpl.php index cross site scripting

Quick assessment

Affected

InstantSoft icms2

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 InstantSoft icms2 2.18.2 及更早版本中发现一个漏洞。该问题影响组件“私有消息处理器”（Private Message Handler）中文件的函数。对参数的恶意操控会导致跨站脚本攻击（XSS）。该漏洞可由远程发起攻击。此漏洞的利用代码已公开披露，并可被利用。补丁标识名为。建议应用该补丁以解决此问题。

CVSS 3.5 · Low EPSS 0.35% · P26 Updated Oct 11, 2026

Possible ATT&CK Techniques 2 AI

T1059 · Command and Scripting Interpreter T1189 · Drive-by Compromise

Affected Version Matrix 3

Vendor	Product	Version Range	Status
InstantSoft	icms2	`2.18.0`	affected
		`2.18.1`	affected
		`2.18.2`	affected

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Vulnerability Information

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Vulnerability Title

InstantSoft icms2 Private Message index.tpl.php index cross site scripting

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability has been found in InstantSoft icms2 up to 2.18.2. This issue affects the function index of the file templates/default/controllers/messages/index.tpl.php of the component Private Message Handler. Such manipulation of the argument nickname leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 3a1ec8fcb073a46d06a2ab83bc2bf68225834281. It is best practice to apply a patch to resolve this issue.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
InstantSoft	icms2	2.18.0	`cpe:2.3:a:instantsoft:icms2::::::::`

II. Public POCs for CVE-2026-108566

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-108566

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Patches & Fixes for CVE-2026-108566 (1)

🔗 Поддержка копирования пунктов меню; · instantsoft/icms2@3a1ec8f · GitHub Read full article patch

Vendor Pages for CVE-2026-108566 (1)

🔗 GitHub - instantsoft/icms2: Self-hosted Site Management System · GitHub product

https://www.cve.org/CVERecord?id=CVE-2026-108566

Same Patch Batch · InstantSoft · 2026-10-11 · 3 CVEs total

CVE-2026-108567	4.3 MEDIUM	InstantSoft icms2 Image image.php files_delete_file path traversal
CVE-2026-108568	4.3 MEDIUM	InstantSoft icms2 Billing paypal.php validatePaypalOrder data authenticity

IV. Related Vulnerabilities

Same product: icms2

Same vendor: InstantSoft

Same weakness: CWE-79

V. Comments for CVE-2026-108566

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-108566— InstantSoft icms2 Private Message index.tpl.php index cross site scripting

Quick assessment

Possible ATT&CK Techniques 2 AI

Affected Version Matrix 3

I. Basic Information for CVE-2026-108566

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-108566

III. Intelligence Information for CVE-2026-108566

Patches & Fixes for CVE-2026-108566 (1)

Vendor Pages for CVE-2026-108566 (1)

Same Patch Batch · InstantSoft · 2026-10-11 · 3 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-108566

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