CVE-2020-35849: Mantisbt/mantisbt MantisBT Incorrect Authorization For Bug_revision_view_page.php Vulnerability

HIGH
Advisory Identifier: GHSA-7j8m-fm49-xgmg
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CVSS 7.5
CWE-863
Published
Advisory Summary

CVE-2020-35849 is a HIGH (CVSS 7.5) mantisbt incorrect authorization for bug_revision_view_page.php vulnerability (CWE-863: Incorrect Authorization) affecting Mantisbt/mantisbt libraries in the Packagist ecosystem. The issue involves mantisbt incorrect authorization for bug_revision_view_page.php check. Remediation is available by upgrading affected packages to version 2.24.4.

CVE-2020-35849 at a Glance

CVE Identifier CVE-2020-35849
GHSA Identifier GHSA-7j8m-fm49-xgmg
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-863: Incorrect Authorization
Affected Product Mantisbt/mantisbt
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2020-35849

To remediate this vulnerability, upgrade all affected Mantisbt/mantisbt dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

mantisbt/mantisbt fixed: 2.24.4 
Upgrade mantisbt/mantisbt to 2.24.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for mantisbt/mantisbt

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35849, inspect your project dependencies for Mantisbt/mantisbt:

inspect dependencies for mantisbt/mantisbt

Analyze the terminal output to locate any version of Mantisbt/mantisbt in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.24.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Mantisbt/mantisbt, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in MantisBT before 2.24.4. An incorrect access check in bug_revision_view_page.php allows an unprivileged attacker to view the Summary field of private issues, as well as bugnotes revisions, gaining access to potentially confidential information via the bugnote_id parameter.

CVE-2020-35849 Affected Mantisbt/mantisbt Versions

1 component(s)
Fixed Versions:
2.24.4
Product / Package Ecosystem Affected Versions Fixed Version
mantisbt/mantisbt
 Packagist
< 2.24.4
2.24.4

References

NVD — CVE-2020-35849 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35849
Security Fix Commit FIX COMMIT
https://github.com/mantisbt/mantisbt/commit/e9fd168c519a46c2cd0f3cb835e9ce5dba77fc4d
Mantisbt/mantisbt Source Repository REPOSITORY
https://github.com/mantisbt/mantisbt
mantisbt.org/bugs/view.php WEB
https://mantisbt.org/bugs/view.php?id=27370

Frequently Asked Questions

What is CVE-2020-35849?
CVE-2020-35849 is a security vulnerability in Mantisbt/mantisbt involving MantisBT Incorrect Authorization for bug_revision_view_page.php check under CWE-863: Incorrect Authorization.
Which Mantisbt/mantisbt versions are affected?
Affected versions include releases prior to 2.24.4 across affected packages: mantisbt/mantisbt.
What version fixes CVE-2020-35849?
Upgrading to 2.24.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mantisbt/mantisbt affected?
Yes, mantisbt/mantisbt is affected in releases prior to 2.24.4. Upgrade your dependency to 2.24.4 or later.
What is the CVSS score of CVE-2020-35849?
CVE-2020-35849 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2020-35849?
CVE-2020-35849 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check Packagist dependencies for CVE-2020-35849?
Run the dependency tree command: 'inspect dependencies for mantisbt/mantisbt'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-7j8m-fm49-xgmg",
  "modified" : "2025-05-30T14:01:06Z",
  "published" : "2022-05-24T17:37:48Z",
  "aliases" : [ "CVE-2020-35849" ],
  "summary" : "MantisBT Incorrect Authorization for bug_revision_view_page.php check",
  "details" : "An issue was discovered in MantisBT before 2.24.4. An incorrect access check in bug_revision_view_page.php allows an unprivileged attacker to view the Summary field of private issues, as well as bugnotes revisions, gaining access to potentially confidential information via the bugnote_id parameter.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mantisbt/mantisbt"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.24.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.24.3"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35849"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/commit/e9fd168c519a46c2cd0f3cb835e9ce5dba77fc4d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mantisbt/mantisbt"
  }, {
    "type" : "WEB",
    "url" : "https://mantisbt.org/bugs/view.php?id=27370"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-05-30T14:01:06Z",
    "nvd_published_at" : "2020-12-30T19:15:00Z"
  }
}