{"cve":"CVE-2025-66407","nvd":{"published":"2025-12-16T00:16:02.357","modified":"2026-10-07T19:10:00.160","status":"Analyzed","description":"Weblate is a web based localization tool. The Create Component functionality in Weblate allows authorized users to add new translation components by specifying both a version control system and a source code repository URL to pull from. However, prior to version 5.15, the repository URL field is not validated or sanitized, allowing an attacker to supply arbitrary protocols, hostnames, and IP addresses, including localhost, internal network addresses, and local filenames. When the Mercurial version control system is selected, Weblate exposes the full server-side HTTP response for the provided URL. This effectively creates a server-side request forgery (SSRF) primitive that can probe internal services and return their contents. In addition to accessing internal HTTP endpoints, the behavior also enables local file enumeration by attempting file:// requests. While file contents may not always be returned, the application’s error messages clearly differentiate between files that exist and files that do not, revealing information about the server’s filesystem layout. In cloud environments, this behavior is particularly dangerous, as internal-only endpoints such as cloud metadata services may be accessible, potentially leading to credential disclosure and full environment compromise. This has been addressed in the Weblate 5.15 release. As a workaround, remove Mercurial from `VCS_BACKENDS`; the Git backend is not affected. The Git backend was already configured to block the file protocol and does not expose the HTTP response content in the error message.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","score":5.0},"cwes":["CWE-918","CWE-352"],"references":["https://github.com/WeblateOrg/weblate/pull/17102","https://github.com/WeblateOrg/weblate/pull/17103","https://github.com/WeblateOrg/weblate/security/advisories/GHSA-hfpv-mc5v-p9mm"],"products":["weblate:weblate"],"source":"nvd","synced_at":"2026-10-19T22:17:07.138532058+00:00"},"epss":{"cve":"CVE-2025-66407","score":0.0024,"percentile":0.14944,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-hfpv-mc5v-p9mm","url":"https://osv.dev/vulnerability/GHSA-hfpv-mc5v-p9mm","summary":"Weblate has a Server-Side Request Forgery issue","modified":"2026-05-26T16:45:09.836676227Z","packages":[{"ecosystem":"PyPI","name":"weblate","purl":"pkg:pypi/weblate","ranges":["<5.15"],"fixed":["5.15"]}]},{"id":"PYSEC-2025-231","url":"https://osv.dev/vulnerability/PYSEC-2025-231","summary":"","modified":"2026-05-20T09:19:23.676060Z","packages":[{"ecosystem":"PyPI","name":"weblate","purl":"pkg:pypi/weblate","ranges":["<5.15"],"fixed":["5.15"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}