CVE-2026-55228: Weblate Weblate Has IDOR Vulnerability

HIGH
Advisory Identifier: GHSA-2q2q-jr9g-v9rf
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CVSS 8.1
CWE-639
Published
Advisory Summary

CVE-2026-55228 is a HIGH (CVSS 8.1) weblate has idor vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Weblate libraries in the PyPI ecosystem. The issue involves weblate has idor in groupviewset that allows authenticated project manager to gain unauthorized read access to any private project. Remediation is available by upgrading affected packages to version 2026.7.

CVE-2026-55228 at a Glance

CVE Identifier CVE-2026-55228
GHSA Identifier GHSA-2q2q-jr9g-v9rf
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product Weblate
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

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

How to Fix CVE-2026-55228

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

Weblate fixed: 2026.7 
pip install Weblate>=2026.7
Verify Direct and Transitive Dependencies

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

pip show Weblate

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-55228, inspect your installed packages using pip:

pip show Weblate

Analyze the terminal output to locate any version of Weblate in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2026.7), your application is affected.

Note: The pip show Weblate command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Weblate, 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

### Impact The API did not properly handle project- and workspace-scoped teams and allowed setting invalid configurations, including granting access to projects the user has no access to. ### Patches * https://github.com/WeblateOrg/weblate/pull/19970 ### References Parts of this issue were independently reported by four reporters: * @H3xV0rT3x via GitHub * [imhego](https://hackerone.com/imhego) via HackerOne * [v01demort](https://hackerone.com/v01demort) via HackerOne * [b4nder](https://hackerone.com/b4nder) via HackerOne

CVE-2026-55228 Affected Weblate Versions

1 component(s)
Fixed Versions:
2026.7
Product / Package Ecosystem Affected Versions Fixed Version
Weblate
pypi/Weblate
PyPI
< 2026.7
2026.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-2q2q-jr9g-v9rf
NVD — CVE-2026-55228 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55228
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate/pull/19970
Security Fix Commit FIX COMMIT
https://github.com/WeblateOrg/weblate/commit/19babc99b05f2cc299b5090f90f79d8181f25d79
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate

Frequently Asked Questions

What is CVE-2026-55228?
CVE-2026-55228 is a security vulnerability in Weblate involving Weblate has IDOR in GroupViewSet that allows authenticated project manager to gain unauthorized read access to any private project under CWE-639: Authorization Bypass Through User-Controlled Key.
Which Weblate versions are affected?
Affected versions include releases prior to 2026.7 across affected packages: Weblate.
What version fixes CVE-2026-55228?
Upgrading to 2026.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Weblate affected?
Yes, Weblate is affected in releases prior to 2026.7. Upgrade your dependency to 2026.7 or later.
What is the CVSS score of CVE-2026-55228?
CVE-2026-55228 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-55228?
CVE-2026-55228 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check PyPI dependencies for CVE-2026-55228?
Run the dependency tree command: 'pip show Weblate'. 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-2q2q-jr9g-v9rf",
  "modified" : "2026-08-28T18:47:29Z",
  "published" : "2026-08-28T18:47:29Z",
  "aliases" : [ "CVE-2026-55228" ],
  "summary" : "Weblate has IDOR in GroupViewSet that allows authenticated project manager to gain unauthorized read access to any private project",
  "details" : "### Impact\nThe API did not properly handle project- and workspace-scoped teams and allowed setting invalid configurations, including granting access to projects the user has no access to.\n\n### Patches\n* https://github.com/WeblateOrg/weblate/pull/19970\n\n\n### References\n\nParts of this issue were independently reported by four reporters:\n * @H3xV0rT3x via GitHub\n * [imhego](https://hackerone.com/imhego) via HackerOne\n * [v01demort](https://hackerone.com/v01demort) via HackerOne\n * [b4nder](https://hackerone.com/b4nder) via HackerOne",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Weblate"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2026.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/security/advisories/GHSA-2q2q-jr9g-v9rf"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55228"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/pull/19970"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/commit/19babc99b05f2cc299b5090f90f79d8181f25d79"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WeblateOrg/weblate"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-28T18:47:29Z",
    "nvd_published_at" : "2026-08-26T21:16:38Z"
  }
}