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CVE-2026-67281— Unauthenticated file read in Mikrotik RouterOS

Quick assessment

Affected
Mikrotik RouterOS
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.

RouterOS WebFig 存在一个未认证的文件读取漏洞，位于 路径。新分配的会话中保留了一个过期的、未初始化的 principal 指针，该指针用于文件授权。未认证的 attacker（攻击者）可以通过操纵内存分配器，使得文件服务路径以足够权限解引用该指针；随后，通过构造包含父目录组件的加密 URI，攻击者可以跳出 WebFig 的文件命名空间，从而泄露由 root 用户拥有的文件，包括包含凭据的配置文件。该问题已在以下版本中修复：6.49.21（长期支持版）、7.23.4（长期支持版）和 7.24.2（稳定

CVSS 8.7 · High EPSS 0.46% · P38

Affected Version Matrix 3

VendorProduct Version RangeStatus
Mikrotik RouterOS 7.24< 7.24.2 affected
7.0.0< 7.23.4 affected
6.0.0< 6.49.21 affected
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I. Basic Information for CVE-2026-67281

Vulnerability Information
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Vulnerability Title
Unauthenticated file read in Mikrotik RouterOS
Source: CVE Program / CVE List V5
Vulnerability Description
RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare the allocator so that the file-serving path dereferences this pointer with sufficient rights, then supply parent-directory components in an encrypted URI to escape the WebFig file namespace and disclose root-owned files, including configuration stores containing credentials.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用未经初始化的指针
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mikrotik RouterOS 7.24 ~ 7.24.2 -

II. Public POCs for CVE-2026-67281

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III. Intelligence Information for CVE-2026-67281

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Security Blog Posts for CVE-2026-67281 (3)

Vendor Pages for CVE-2026-67281 (4)

Same Patch Batch · Mikrotik · 2026-09-05 · 6 CVEs total

CVE-2026-86060 9.2 CRITICAL SSH session privilege manipulation via a crafted username in Mikrotik RouterOS
CVE-2026-67276 9.2 CRITICAL SSH user impersonation possible in Mikrotik RouterOS
CVE-2026-67277 8.8 HIGH Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
CVE-2026-67279 6.9 MEDIUM SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS
CVE-2026-67278 6.3 MEDIUM TLS server impersonation possible in Mikrotik RouterOS

IV. Related Vulnerabilities

Same product: RouterOS
Same vendor: Mikrotik
Same weakness: CWE-824

V. Comments for CVE-2026-67281

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