CVE-2026-34744: Mantisbt/mantisbt MantisBT Has An Authorization Bypass Vulnerability

MODERATE
Advisory Identifier: GHSA-rmp5-5jj7-gmvf
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CWE-200
Published
Advisory Summary

CVE-2026-34744 is a MODERATE mantisbt has an authorization bypass vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Mantisbt/mantisbt libraries in the Packagist ecosystem. The issue involves mantisbt has an authorization bypass that allows reading attachments after losing access to a private issue. Remediation is available by upgrading affected packages to version 2.28.2.

CVE-2026-34744 at a Glance

CVE Identifier CVE-2026-34744
GHSA Identifier GHSA-rmp5-5jj7-gmvf
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Mantisbt/mantisbt
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-34744

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: 2.28.2 
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-2026-34744, 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 2.28.2), 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/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 permits a user to list and download their own attachments from an Issue created by another user, even after that Issue becomes private and direct access to it is denied. ### Impact The loss of confidentiality caused by this vulnerability is minimal, considering that only the attachments that were previously uploaded by the user themselves remains accessible. ### Patches - de7bdeec36de066235e38a77bf056917d951c84d ### Workarounds None. ### Credits Thanks to Vishal Shukla for discovering and responsibly reporting the issue.

CVE-2026-34744 Affected Mantisbt/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

GitHub Advisory / Wiki ADVISORY
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-rmp5-5jj7-gmvf
NVD — CVE-2026-34744 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34744
Security Fix Commit FIX COMMIT
https://github.com/mantisbt/mantisbt/commit/de7bdeec36de066235e38a77bf056917d951c84d
Mantisbt/mantisbt Source Repository REPOSITORY
https://github.com/mantisbt/mantisbt
mantisbt.org/bugs/view.php WEB
https://mantisbt.org/bugs/view.php?id=36977

Frequently Asked Questions

What is CVE-2026-34744?
CVE-2026-34744 is a security vulnerability in Mantisbt/mantisbt involving MantisBT has an authorization bypass that allows reading attachments after losing access to a private issue under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Mantisbt/mantisbt versions are affected?
Affected versions include releases prior to 2.28.2 across affected packages: mantisbt/mantisbt.
What version fixes CVE-2026-34744?
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-2026-34744?
CVE-2026-34744 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-2026-34744?
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-rmp5-5jj7-gmvf",
  "modified" : "2026-06-05T14:12:28Z",
  "published" : "2026-05-11T19:32:36Z",
  "aliases" : [ "CVE-2026-34744" ],
  "summary" : "MantisBT has an authorization bypass that allows reading attachments after losing access to a private issue",
  "details" : "MantisBT permits a user to list and download their own attachments from an Issue created by another user, even after that Issue becomes private and direct access to it is denied.\n\n### Impact\nThe loss of confidentiality caused by this vulnerability is minimal, considering that only the attachments that were previously uploaded by the user themselves remains accessible.\n\n### Patches\n- de7bdeec36de066235e38a77bf056917d951c84d\n\n### Workarounds\nNone.\n\n### Credits\n\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-rmp5-5jj7-gmvf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34744"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/commit/de7bdeec36de066235e38a77bf056917d951c84d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mantisbt/mantisbt"
  }, {
    "type" : "WEB",
    "url" : "https://mantisbt.org/bugs/view.php?id=36977"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-11T19:32:36Z",
    "nvd_published_at" : "2026-05-19T23:16:57Z"
  }
}