CVE-2026-34393: Weblate Privilege Escalation Vulnerability

HIGH
Advisory Identifier: GHSA-3382-gw9x-477v
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CVSS 8.8
CWE-269
Published
Advisory Summary

CVE-2026-34393 is a HIGH (CVSS 8.8) privilege escalation vulnerability (CWE-269: Improper Privilege Management) affecting Weblate libraries in the PyPI ecosystem. The issue involves privilege escalation in the user api endpoint. Remediation is available by upgrading affected packages to version 5.17.

CVE-2026-34393 at a Glance

CVE Identifier CVE-2026-34393
GHSA Identifier GHSA-3382-gw9x-477v
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-269: Improper Privilege Management
Affected Product Weblate
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.8

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:H).

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 High (A:H)

How to Fix CVE-2026-34393

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: 5.17 
pip install Weblate>=5.17
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-2026-34393, 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 5.17), 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-269: Improper Privilege Management, where the product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that 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 user patching API endpoint didn't properly limit the scope of edits. ### Patches * https://github.com/WeblateOrg/weblate/pull/18687 ### References Thanks to @tikket1 and @DavidCarliez for reporting this via GitHub. We received two individual reports for this.

CVE-2026-34393 Affected Weblate Versions

1 component(s)
Fixed Versions:
5.17
Product / Package Ecosystem Affected Versions Fixed Version
Weblate
pypi/Weblate
PyPI
< 5.17
5.17

References

GitHub Advisory / Wiki ADVISORY
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-3382-gw9x-477v
NVD — CVE-2026-34393 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34393
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate/pull/18687
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate
Weblate Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/weblate/PYSEC-2026-155.yaml

Frequently Asked Questions

What is CVE-2026-34393?
CVE-2026-34393 is a security vulnerability in Weblate involving Privilege escalation in the user API endpoint under CWE-269: Improper Privilege Management.
Which Weblate versions are affected?
Affected versions include releases prior to 5.17 across affected packages: Weblate.
What version fixes CVE-2026-34393?
Upgrading to 5.17 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Weblate affected?
Yes, Weblate is affected in releases prior to 5.17. Upgrade your dependency to 5.17 or later.
What is the CVSS score of CVE-2026-34393?
CVE-2026-34393 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-34393?
CVE-2026-34393 is classified under CWE-269: Improper Privilege Management (The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.).
How can I check PyPI dependencies for CVE-2026-34393?
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-3382-gw9x-477v",
  "modified" : "2026-06-08T19:54:31Z",
  "published" : "2026-04-16T20:43:48Z",
  "aliases" : [ "CVE-2026-34393" ],
  "summary" : "Weblate: Privilege escalation in the user API endpoint",
  "details" : "### Impact\n\nThe user patching API endpoint didn't properly limit the scope of edits.\n\n### Patches\n* https://github.com/WeblateOrg/weblate/pull/18687\n\n\n### References\nThanks to @tikket1 and @DavidCarliez for reporting this via GitHub. We received two individual reports for this.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Weblate"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.17"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/security/advisories/GHSA-3382-gw9x-477v"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34393"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/pull/18687"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WeblateOrg/weblate"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/weblate/PYSEC-2026-155.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-269" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T20:43:48Z",
    "nvd_published_at" : "2026-04-15T19:16:36Z"
  }
}