CVE-2026-55227: Weblate Private Weblate Projects Vulnerable To Vulnerability

MODERATE
Advisory Identifier: GHSA-2p9g-x3cv-5hh4
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CVSS 4.3
CWE-203
Published
Advisory Summary

CVE-2026-55227 is a MODERATE (CVSS 4.3) private weblate projects vulnerable to vulnerability (CWE-203: Observable Discrepancy) affecting Weblate libraries in the PyPI ecosystem. The issue involves private weblate projects vulnerable to observable object existence disclosure via globally scoped object lookups. Remediation is available by upgrading affected packages to version 2026.7.

CVE-2026-55227 at a Glance

CVE Identifier CVE-2026-55227
GHSA Identifier GHSA-2p9g-x3cv-5hh4
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-203: Observable Discrepancy
Affected Product Weblate
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:L/I:N/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 Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-55227

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-2026-55227, 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-203: Observable Discrepancy, where the product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor. 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 several endpoints could leak object existence information to users who had no access to it by HTTP status code 403 instead of 404. ### Patches * https://github.com/WeblateOrg/weblate/pull/19971 ### References Thanks to Yaohui Wang for reporting this via GitHub.

CVE-2026-55227 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-2p9g-x3cv-5hh4
NVD — CVE-2026-55227 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55227
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate/pull/19971
Security Fix Commit FIX COMMIT
https://github.com/WeblateOrg/weblate/commit/836bc082803d49d02f2831ec8339268eb66bcdae
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate
Weblate Release RELEASE
https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.7

Frequently Asked Questions

What is CVE-2026-55227?
CVE-2026-55227 is a security vulnerability in Weblate involving Private Weblate projects vulnerable to observable object existence disclosure via globally scoped object lookups under CWE-203: Observable Discrepancy.
Which Weblate versions are affected?
Affected versions include releases prior to 2026.7 across affected packages: weblate.
What version fixes CVE-2026-55227?
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-2026-55227?
CVE-2026-55227 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-55227?
CVE-2026-55227 is classified under CWE-203: Observable Discrepancy (The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.).
How can I check PyPI dependencies for CVE-2026-55227?
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-2p9g-x3cv-5hh4",
  "modified" : "2026-08-28T18:46:54Z",
  "published" : "2026-08-28T18:46:54Z",
  "aliases" : [ "CVE-2026-55227" ],
  "summary" : "Private Weblate projects vulnerable to observable object existence disclosure via globally scoped object lookups",
  "details" : "### Impact\nThe several endpoints could leak object existence information to users who had no access to it by HTTP status code 403 instead of 404.\n\n### Patches\n* https://github.com/WeblateOrg/weblate/pull/19971\n\n### References\nThanks to Yaohui Wang for reporting this via GitHub.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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-2p9g-x3cv-5hh4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-55227"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/pull/19971"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/commit/836bc082803d49d02f2831ec8339268eb66bcdae"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WeblateOrg/weblate"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/releases/tag/weblate-2026.7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-203" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-28T18:46:54Z",
    "nvd_published_at" : "2026-08-26T21:16:38Z"
  }
}