CVE-2026-67281

Published Sep 5, 2026

Last updated 9 days ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-67281 describes an unauthenticated file-read vulnerability found in MikroTik RouterOS WebFig. This flaw exists within the `/jsproxy` path, where a newly allocated session can retain a stale, uninitialized principal pointer used for file authorization. An attacker can exploit this by manipulating the allocator to dereference the pointer with sufficient rights, then using parent-directory components in an encrypted URI to escape the WebFig file namespace. This allows for the disclosure of root-owned files, including configuration stores that may contain sensitive credentials. The vulnerability affects various versions of RouterOS, with fixes released in versions 6.49.21 (Long-term), 7.23.4 (Long-term), and 7.24.2 (Stable).

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 affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)
Source: cvd@cert.pl
NVD status: Analyzed
Products: routeros

Risk scores

CVSS 4.0

Type: Secondary
Base score: 8.7
Impact score: -
Exploitability score: -
Vector string: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity: HIGH

CVSS 3.1

Type: Primary
Base score: 7.5
Impact score: 3.6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Severity: HIGH

Weaknesses

cvd@cert.pl: CWE-22

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "FFFF7B28-6339-4B25-B724-69C5144E70CD",
            "versionEndExcluding": "7.23.4",
            "versionStartIncluding": "7.20",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "A41D6B3C-D321-4C61-B3D5-00F8276CB4AC",
            "versionEndExcluding": "7.24.2",
            "versionStartIncluding": "7.24",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.