CVE-2020-26286: Vulnerability Analysis & Exploit Details

Status: Analyzed - Last modified: 30-12-2020 Published: 29-12-2020

CVE-2020-26286
Vulnerability Scoring

7.5
/10

Attack Complexity Details

  • Attack Complexity: Low Impact
  • Attack Vector: NETWORK
  • Privileges Required: None
  • Scope: UNCHANGED
  • User Interaction: NONE

CIA Impact Definition

  • Confidentiality:
  • Integrity: HIGH IMPACT
  • Availability:

CVE-2020-26286 Vulnerability Summary

HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an unauthenticated attacker can upload arbitrary files to the upload storage backend including HTML, JS and PHP files. The problem is patched in HedgeDoc 1.7.1. You should however verify that your uploaded file storage only contains files that are allowed, as uploaded files might still be served. As workaround it's possible to block the `/uploadimage` endpoint on your instance using your reverse proxy. And/or restrict MIME-types and file names served from your upload file storage.

Access Complexity Graph for CVE-2020-26286

Impact Analysis for CVE-2020-26286

CVE-2020-26286: Detailed Information and External References

EPSS

0.00125

EPSS %

0.48090

References

0.00125

CWE

CWE-434

CAPEC

0.00125

  • Accessing Functionality Not Properly Constrained by ACLs: In applications, particularly web applications, access to functionality is mitigated by an authorization framework. This framework maps Access Control Lists (ACLs) to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application, or can run queries for data that they otherwise not supposed to.

Vulnerable Configurations

  • cpe:2.3:a:hedgedoc:hedgedoc:-:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:-:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.3.3:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.3.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.3.4:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.3.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.4.4:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.4.5:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.4.6:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:0.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:0.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.3.2:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.7.0:-:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.7.0:-:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.7.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.7.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:hedgedoc:hedgedoc:1.7.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:hedgedoc:hedgedoc:1.7.0:rc2:*:*:*:*:*:*

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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