CVE-2026-33212: Weblate Improper Access Control For Pending Vulnerability

LOW
Advisory Identifier: GHSA-vj45-x3pj-f4w4
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CVSS 3.1
CWE-284
Published
Advisory Summary

CVE-2026-33212 is a LOW (CVSS 3.1) improper access control for pending vulnerability (CWE-284: Improper Access Control) affecting Weblate libraries in the PyPI ecosystem. The issue involves improper access control for pending tasks in api. Remediation is available by upgrading affected packages to version 5.17.

CVE-2026-33212 at a Glance

CVE Identifier CVE-2026-33212
GHSA Identifier GHSA-vj45-x3pj-f4w4
Severity LOW
CVSS v3.1 Base Score 3.1
CWE Classification CWE-284: Improper Access Control
Affected Product Weblate
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 3.1

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2026-33212

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-2026-33212, 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-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from 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 API for tasks didn't verify user access for pending tasks. This could expose logs of in-progress operations to users who don't have access to given scope. ### Patches * https://github.com/WeblateOrg/weblate/pull/18515 ### Workarounds The attacker needs to guess the random UUID of the task, so exploiting this is unlikely with the default API rate limits. ### References This issue was identified by Michal Čihař.

CVE-2026-33212 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-vj45-x3pj-f4w4
NVD — CVE-2026-33212 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33212
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate/pull/18515
Security Fix Commit FIX COMMIT
https://github.com/WeblateOrg/weblate/commit/4e06b12cd05d087db68384e09d5f70fe883f2b70
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate

Frequently Asked Questions

What is CVE-2026-33212?
CVE-2026-33212 is a security vulnerability in Weblate involving Improper access control for pending tasks in API under CWE-284: Improper Access Control.
Which Weblate versions are affected?
Affected versions include releases prior to 5.17 across affected packages: weblate.
What version fixes CVE-2026-33212?
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-2026-33212?
CVE-2026-33212 has a CVSS v3.1 base score of 3.1 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-33212?
CVE-2026-33212 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check PyPI dependencies for CVE-2026-33212?
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-vj45-x3pj-f4w4",
  "modified" : "2026-04-16T20:41:10Z",
  "published" : "2026-04-16T20:41:10Z",
  "aliases" : [ "CVE-2026-33212" ],
  "summary" : "Weblate: Improper access control for pending tasks in API",
  "details" : "### Impact\nThe API for tasks didn't verify user access for pending tasks. This could expose logs of in-progress operations to users who don't have access to given scope.\n\n### Patches\n* https://github.com/WeblateOrg/weblate/pull/18515\n\n### Workarounds\nThe attacker needs to guess the random UUID of the task, so exploiting this is unlikely with the default API rate limits.\n\n### References\nThis issue was identified by Michal Čihař.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/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" : "5.17"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/security/advisories/GHSA-vj45-x3pj-f4w4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33212"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/pull/18515"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/commit/4e06b12cd05d087db68384e09d5f70fe883f2b70"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WeblateOrg/weblate"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T20:41:10Z",
    "nvd_published_at" : "2026-04-15T18:17:19Z"
  }
}