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CVE-2026-67276— SSH user impersonation possible in Mikrotik RouterOS

Quick assessment

Affected
Mikrotik RouterOS
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MikroTik routeros是拉脱维亚MikroTik公司的一款网络操作系统软件。 MikroTik routeros 6.0.0版本至6.49.21之前版本、7.0.0版本至7.23.4之前版本和7.24版本至7.24.2之前版本存在加密问题漏洞，该漏洞源于SSH认证请求与授权用户密钥匹配时未比较完整的RSA公钥，仅检查密钥类型和模数而忽略指数，可能导致攻击者使用客户端提供的密钥伪造有效签名，从而在无需私钥的情况下以目标用户身份打开SSH命令通道。

CVSS 9.2 · Critical EPSS 6.45% · P94

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mikrotik RouterOS 7.24< 7.24.2 affected
7.9< 7.23.4 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 affects only 7.x branch was fixed in versions: 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
Vulnerability Title
MikroTik routeros 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MikroTik routeros是拉脱维亚MikroTik公司的一款网络操作系统软件。 MikroTik routeros 6.0.0版本至6.49.21之前版本、7.0.0版本至7.23.4之前版本和7.24版本至7.24.2之前版本存在加密问题漏洞，该漏洞源于SSH认证请求与授权用户密钥匹配时未比较完整的RSA公钥，仅检查密钥类型和模数而忽略指数，可能导致攻击者使用客户端提供的密钥伪造有效签名，从而在无需私钥的情况下以目标用户身份打开SSH命令通道。
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
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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