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Medium

Weblate Vulnerable to Authenticated SSRF via Project Backup Import bypassing validate_repo_url

  • Disclosed: 30.04.2026
  • Updated: 11.10.2026 14:17

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

Workarounds

Limiting who can create projects limits the scope.

Resources

Weblate thanks @fg0x0 for reporting this vulnerability via GitHub.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) weblate < 5.17.1 5.17.1

References

CVSS score -
CVSS vector
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
Weakness (CWE)
CWE-20, CWE-918
Platform
Python (PyPI)
Package
weblate
Disclosed
30.04.2026
Updated
11.10.2026 14:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-2317 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-cwcx-382v-8m9g - CC BY 4.0

Vulnerability history: weblate

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (36) in the archive
Total entries
36
First → latest
03.2017 08.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 6
  • Medium 22
  • Low 7

Disclosures per year

Severity:
  1. Weblate has IDOR in GroupViewSet that allows authenticated project manager to gain unauthorized read access to any private project
    High · 8.1 CVE-2026-55228 < 2026.7 2026.7
  2. Weblate Vulnerable to Authenticated SSRF via Project Backup Import bypassing validate_repo_url this entry
    Medium CVE-2026-41654 < 5.17.1 5.17.1
  3. Weblate: Privilege escalation in the user API endpoint
    High · 8.8 CVE-2026-34393 < 5.17 5.17
  4. Weblate: Arbitrary File Read via Symlink
    High · 7.7 CVE-2026-34242 < 5.17 5.17
  5. Weblate: Remote code execution during backup restoration
    High · 8.0 CVE-2026-33435 < 5.17 5.17
  6. Weblate is vulnerable to RCE through Git config file overwrite
    Critical · 9.1 CVE-2025-68398 < 5.15.1 5.15.1
  7. Weblate has an arbitrary file read via symbolic links
    High · 7.7 CVE-2025-68279 < 5.15.1 5.15.1
  8. Weblate is a web based localization tool. Prior to version 5.11, when creating a new component from an existing component that has a source code repository URL specified in settings, this URL is inclu
    High · 7.5 CVE-2025-32021 < 5.11 5.11

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