GHSA-CWCX-382V-8M9G

Vulnerability from github – Published: 2026-04-30 17:28 – Updated: 2026-05-08 21:47
VLAI
Summary
Weblate Vulnerable to Authenticated SSRF via Project Backup Import bypassing validate_repo_url
Details

Impact

An authenticated user with project.add permission (default on hosted Weblate SaaS and for any user holding an active billing/trial plan) can import a crafted project backup ZIP whose components/<name>.json contains an attacker-chosen repo URL pointing at a private address (e.g. http://127.0.0.1:9999/) or using a non-allow-listed scheme (e.g. file://, git://). Weblate persists the component via Component.objects.bulk_create([component])[0], which bypasses Django's full_clean() and therefore never runs the validate_repo_url validator. The URL is subsequently written verbatim into .git/config by configure_repo(pull=False).

Patches

  • https://github.com/WeblateOrg/weblate/pull/19061
  • https://github.com/WeblateOrg/weblate/pull/19062

Workarounds

Limiting who can create projects limits the scope.

Resources

Weblate thanks @fg0x0 for reporting this vulnerability via GitHub.

Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "weblate"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.17.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41654"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-30T17:28:41Z",
    "nvd_published_at": "2026-05-07T15:16:07Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nAn authenticated user with `project.add` permission (default on hosted Weblate SaaS and for any user holding an active billing/trial plan) can import a crafted project backup ZIP whose `components/\u003cname\u003e.json` contains an attacker-chosen `repo` URL pointing at a **private address** (e.g. `http://127.0.0.1:9999/`) or using a **non-allow-listed scheme** (e.g. `file://`, `git://`). Weblate persists the component via `Component.objects.bulk_create([component])[0]`, which bypasses Django\u0027s `full_clean()` and therefore never runs the `validate_repo_url` validator. The URL is subsequently written verbatim into `.git/config` by `configure_repo(pull=False)`.\n\n### Patches\n* https://github.com/WeblateOrg/weblate/pull/19061\n* https://github.com/WeblateOrg/weblate/pull/19062 \n\n### Workarounds\nLimiting who can create projects limits the scope.\n\n### Resources\nWeblate thanks @fg0x0 for reporting this vulnerability via GitHub.",
  "id": "GHSA-cwcx-382v-8m9g",
  "modified": "2026-05-08T21:47:36Z",
  "published": "2026-04-30T17:28:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/WeblateOrg/weblate/security/advisories/GHSA-cwcx-382v-8m9g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41654"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WeblateOrg/weblate/pull/19061"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WeblateOrg/weblate/pull/19062"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WeblateOrg/weblate/commit/e1eff1f517c1ee315d69581910baaabb724e5ef0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WeblateOrg/weblate/commit/e4b67a76d95d5165ecb9937f7485fd79223b7f14"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/WeblateOrg/weblate"
    },
    {
      "type": "WEB",
      "url": "https://github.com/WeblateOrg/weblate/releases/tag/weblate-5.17.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Weblate Vulnerable to Authenticated SSRF via Project Backup Import bypassing validate_repo_url"
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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