CVE-2026-34970: MantisBT Bugnote Revision Page Leaks Private Vulnerability

MODERATE
Advisory Identifier: GHSA-crmx-4p49-46m2
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CWE-200
Published
Advisory Summary

CVE-2026-34970 is a MODERATE bugnote revision page leaks private vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting MantisBT libraries in the Packagist ecosystem. The issue involves bugnote revision page leaks private issue metadata after issue access is revoked. Remediation is available by upgrading affected packages to version 2.28.2.

CVE-2026-34970 at a Glance

CVE Identifier CVE-2026-34970
GHSA Identifier GHSA-crmx-4p49-46m2
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product MantisBT
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-34970

To remediate this vulnerability, upgrade all affected 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: 2.28.2 
Upgrade mantisbt/mantisbt to 2.28.2
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-2026-34970, inspect your project dependencies for MantisBT:

inspect dependencies for mantisbt/mantisbt

Analyze the terminal output to locate any version of MantisBT in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.28.2), 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In 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

MantisBT allows a bugnote author to access the note's Revisions page after losing access to the parent private issue. ### Impact Disclosure of the private Issue's Id and Summary. The bugnote full revision body remains secure. ### Patches - 71df1f67e05b2050cd4bd87839e6cc13747cf03f ### Workarounds None ### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue.

CVE-2026-34970 Affected MantisBT Versions

1 component(s)
Fixed Versions:
2.28.2
Product / Package Ecosystem Affected Versions Fixed Version
mantisbt/mantisbt
 Packagist
< 2.28.2
2.28.2

References

MantisBT Security Information SECURITY
https://mantisbt.org/bugs/view.php?id=36978
GitHub Advisory / Wiki ADVISORY
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-crmx-4p49-46m2
NVD — CVE-2026-34970 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34970
Security Fix Commit FIX COMMIT
https://github.com/mantisbt/mantisbt/commit/71df1f67e05b2050cd4bd87839e6cc13747cf03f
MantisBT Source Repository REPOSITORY
https://github.com/mantisbt/mantisbt

Frequently Asked Questions

What is CVE-2026-34970?
CVE-2026-34970 is a security vulnerability in MantisBT involving Bugnote Revision Page Leaks Private Issue Metadata After Issue Access Is Revoked under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which MantisBT versions are affected?
Affected versions include releases prior to 2.28.2 across affected packages: mantisbt/mantisbt.
What version fixes CVE-2026-34970?
Upgrading to 2.28.2 (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 2.28.2. Upgrade your dependency to 2.28.2 or later.
What CWE is associated with CVE-2026-34970?
CVE-2026-34970 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Packagist dependencies for CVE-2026-34970?
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-crmx-4p49-46m2",
  "modified" : "2026-06-05T14:12:38Z",
  "published" : "2026-05-11T19:33:10Z",
  "aliases" : [ "CVE-2026-34970" ],
  "summary" : "MantisBT: Bugnote Revision Page Leaks Private Issue Metadata After Issue Access Is Revoked",
  "details" : "MantisBT allows a bugnote author to access the note's Revisions page after losing access to the parent private issue.\n\n### Impact\nDisclosure of the private Issue's Id and Summary. The bugnote full revision body remains secure.\n\n### Patches\n- 71df1f67e05b2050cd4bd87839e6cc13747cf03f\n\n### Workarounds\nNone\n\n### Credits \nThanks to Vishal Shukla for discovering and responsibly reporting the issue.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mantisbt/mantisbt"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.28.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.28.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-crmx-4p49-46m2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34970"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/commit/71df1f67e05b2050cd4bd87839e6cc13747cf03f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mantisbt/mantisbt"
  }, {
    "type" : "WEB",
    "url" : "https://mantisbt.org/bugs/view.php?id=36978"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-11T19:33:10Z",
    "nvd_published_at" : "2026-05-20T00:16:35Z"
  }
}