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CVE-2026-67276— SSH user impersonation possible 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 在将 SSH 认证请求与授权用户密钥进行匹配时，并未比较完整的 RSA 公钥。它只检查了密钥类型和模数（modulus），却省略了指数（exponent）。由于签名验证使用的是客户端提供的密钥，一个知晓某个授权 RSA 模数的攻击者，可以提供一个指数为 1 的密钥，伪造出一个有效的签名，从而无需私钥即可打开 SSH 命令通道，并以目标用户的身份登录。 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（稳定版）。

CVSS 9.2 · Critical EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

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-2026-67276

Vulnerability Information
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Vulnerability Title
SSH user impersonation possible in Mikrotik RouterOS
Source: CVE Program / CVE List V5
Vulnerability Description
RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.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:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
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-2026-67276

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III. Intelligence Information for CVE-2026-67276

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Security Blog Posts for CVE-2026-67276 (3)

Vendor Pages for CVE-2026-67276 (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-2026-67277 8.8 HIGH Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
CVE-2026-67281 8.7 HIGH Unauthenticated file read in Mikrotik RouterOS
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-347

V. Comments for CVE-2026-67276

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