Weblate Vulnerable to Authenticated SSRF via Project Backup Import bypassing validate_repo_url

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.3 · 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 · score source

EPSS

• CVE-2026-41654: 0.37% estimated exploitation activity in the next 30 days; percentile 31.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.bulkcreate([component])[0], which bypasses Django's fullclean() and therefore never runs the validaterepourl validator. The URL is subsequently written verbatim into .git/config by configurerepo(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.

Published by the source

30 Apr 2026, 17:28 UTC

Last modified by the source

13 Jul 2026, 07:26 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-cwcx-382v-8m9g

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-cwcx-382v-8m9g

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# Patch Next advisory brief: CVE-2026-41654

Advisory: Weblate Vulnerable to Authenticated SSRF via Project Backup Import bypassing validate_repo_url
IDs: CVE-2026-41654, GHSA-cwcx-382v-8m9g
Record: https://patchnext.com/advisories/cve-2026-41654 (revision 3, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: weblate 5.17.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI weblate: affected < 5.17.1; fixed in 5.17.1

## Suggested inspection (read-only)
- `python -m pip show weblate`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on weblate.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-cwcx-382v-8m9g (OSV record GHSA-cwcx-382v-8m9g lists affected ranges: PyPI weblate >=0 <5.17.1 (fixed))
- Verified: https://github.com/advisories/GHSA-cwcx-382v-8m9g (GitHub-reviewed advisory GHSA-cwcx-382v-8m9g lists affected ranges: PyPI weblate >=0 <5.17.1)

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