CVE-2026-41519: Weblate Weblate Doesn't Invalidate API Token Vulnerability

MODERATE
Advisory Identifier: GHSA-6j8j-4qp3-36p2
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CVSS 4.2
CWE-613
Published
Advisory Summary

CVE-2026-41519 is a MODERATE (CVSS 4.2) weblate doesn't invalidate api token vulnerability (CWE-613: Insufficient Session Expiration) affecting Weblate libraries in the PyPI ecosystem. The issue involves weblate doesn't invalidate api token on password change. Remediation is available by upgrading affected packages to version 5.17.1.

CVE-2026-41519 at a Glance

CVE Identifier CVE-2026-41519
GHSA Identifier GHSA-6j8j-4qp3-36p2
Severity MODERATE
CVSS v3.1 Base Score 4.2
CWE Classification CWE-613: Insufficient Session Expiration
Affected Product Weblate
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 4.2

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

How to Fix CVE-2026-41519

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: 5.17.1 
pip install weblate>=5.17.1
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-2026-41519, 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 5.17.1), 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-613: Insufficient Session Expiration, where according to wasc, "insufficient session expiration is when a web site permits an attacker to reuse old session credentials or session ids for authorization.". 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 When a user changes their password, browser sessions are correctly invalidated via `cycle_session_keys()`, but DRF API tokens (`wlu_*` prefix) stored in `authtoken_token` are not revoked. ### Patches * https://github.com/WeblateOrg/weblate/pull/19057 ### Resources Weblate thanks Sang Yu Jeon for reporting this via GitHub.

CVE-2026-41519 Affected Weblate Versions

1 component(s)
Fixed Versions:
5.17.1
Product / Package Ecosystem Affected Versions Fixed Version
weblate
pypi/weblate
PyPI
< 5.17.1
5.17.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/WeblateOrg/weblate/security/advisories/GHSA-6j8j-4qp3-36p2
NVD — CVE-2026-41519 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41519
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate/pull/19057
Security Fix Commit FIX COMMIT
https://github.com/WeblateOrg/weblate/commit/649a2da81700542f95c0807b3c625fc3bb0eaf95
Weblate Source Repository REPOSITORY
https://github.com/WeblateOrg/weblate
Weblate Release RELEASE
https://github.com/WeblateOrg/weblate/releases/tag/weblate-5.17.1

Frequently Asked Questions

What is CVE-2026-41519?
CVE-2026-41519 is a security vulnerability in Weblate involving Weblate Doesn't Invalidate API Token on Password Change under CWE-613: Insufficient Session Expiration.
Which Weblate versions are affected?
Affected versions include releases prior to 5.17.1 across affected packages: weblate.
What version fixes CVE-2026-41519?
Upgrading to 5.17.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is weblate affected?
Yes, weblate is affected in releases prior to 5.17.1. Upgrade your dependency to 5.17.1 or later.
What is the CVSS score of CVE-2026-41519?
CVE-2026-41519 has a CVSS v3.1 base score of 4.2 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-41519?
CVE-2026-41519 is classified under CWE-613: Insufficient Session Expiration (According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization.").
How can I check PyPI dependencies for CVE-2026-41519?
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-6j8j-4qp3-36p2",
  "modified" : "2026-05-08T21:47:33Z",
  "published" : "2026-04-30T17:28:02Z",
  "aliases" : [ "CVE-2026-41519" ],
  "summary" : "Weblate Doesn't Invalidate API Token on Password Change",
  "details" : "### Impact\nWhen a user changes their password, browser sessions are correctly invalidated via `cycle_session_keys()`, but DRF API tokens (`wlu_*` prefix) stored in `authtoken_token` are not revoked.\n\n### Patches\n* https://github.com/WeblateOrg/weblate/pull/19057\n\n### Resources\nWeblate thanks Sang Yu Jeon for reporting this via GitHub.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "weblate"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.17.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/security/advisories/GHSA-6j8j-4qp3-36p2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-41519"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/pull/19057"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/commit/649a2da81700542f95c0807b3c625fc3bb0eaf95"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/WeblateOrg/weblate"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/WeblateOrg/weblate/releases/tag/weblate-5.17.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-613" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-30T17:28:02Z",
    "nvd_published_at" : "2026-05-07T15:16:07Z"
  }
}