CVE-2026-28281— InstantCMS has Multiple CSRF Vulnerabilities
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.
InstantCMS是instantSoft开源的一个免费的开源 CMS。 InstantCMS 2.18.1之前版本存在跨站请求伪造漏洞，该漏洞源于未验证CSRF令牌，可能导致攻击者授予用户版主权限、执行计划任务、将帖子移至垃圾箱以及代表用户接受好友请求。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-28281
Vulnerability Information
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Vulnerability Title
InstantCMS has Multiple CSRF Vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability Description
InstantCMS is a free and open source content management system. Prior to 2.18.1, InstantCMS does not validate CSRF tokens, which allows attackers grant moderator privileges to users, execute scheduled tasks, move posts to trash, and accept friend requests on behalf of the user. This vulnerability is fixed in 2.18.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
InstantCMS 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
InstantCMS是instantSoft开源的一个免费的开源 CMS。 InstantCMS 2.18.1之前版本存在跨站请求伪造漏洞，该漏洞源于未验证CSRF令牌，可能导致攻击者授予用户版主权限、执行计划任务、将帖子移至垃圾箱以及代表用户接受好友请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| instantsoft | icms2 | < 2.18.1 | - |
|
II. Public POCs for CVE-2026-28281
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-28281 (1)
-
Multiple CSRF Vulnerabilities · Advisory · instantsoft/icms2 · GitHub x_refsource_CONFIRM
IV. Related Vulnerabilities
Same product: icms2
-
CVE-2026-48707
InstantCMS vulnerable to SSRF via upload redirect bypass all -
CVE-2026-54611
InstantCMS has Remote Code Execution in package installer -
CVE-2025-59055
InstantCMS vulnerable to Server-Side Request Forgery via pac -
CVE-2024-50348
InstantCMS has a Cross Site Scripting Vulnerability -
CVE-2024-31213
InstantCMS Open Redirect vulnerability
Same vendor: instantsoft
-
CVE-2026-48707
InstantCMS vulnerable to SSRF via upload redirect bypass all -
CVE-2026-54611
InstantCMS has Remote Code Execution in package installer -
CVE-2025-59055
InstantCMS vulnerable to Server-Side Request Forgery via pac -
CVE-2024-50348
InstantCMS has a Cross Site Scripting Vulnerability -
CVE-2024-31213
InstantCMS Open Redirect vulnerability
Same weakness: CWE-352
-
CVE-2026-107831
Jivejdon through 5.0 CSRF via GET-based Account and Thread A -
CVE-2026-78388
Security vulnerabilities have been found in IBM Verify Ident -
CVE-2026-107337
Cross-Site Request Forgery in Malcolm -
CVE-2026-107295
`pydantic-ai-slim` web UI `/api/chat` accepts browser-simple -
CVE-2026-106611
WordPress Forminator plugin <= 1.57.3 - Cross Site Request F
V. Comments for CVE-2026-28281
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