Vikunja has SSRF via Todoist/Trello Migration File Attachment URLs that Allows Reading Internal Network Resources

Exploitation

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

CVSS

6.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L

EPSS

• CVE-2026-33675: 0.28% estimated exploitation activity in the next 30 days; percentile 20.21 (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.

Summary The migration helper functions DownloadFile and DownloadFileWithHeaders in pkg/modules/migration/helpers.go make arbitrary HTTP GET requests without any SSRF protection. When a user triggers a Todoist or Trello migration, file attachment URLs from the third-party API response are passed directly to these functions, allowing an attacker to force the Vikunja server to fetch internal network resources and return the response as a downloadable task attachment. Details The vulnerability exists because the migration HTTP client uses a plain http.Client{} with no URL validation, no private IP blocklist, no redirect restrictions, and no response size limit. Vulnerable code in pkg/modules/migration/helpers.go:38-59: Call site in Todoist migration (pkg/modules/migration/todoist/todoist.go:433-435): The FileURL is deserialized directly from the Todoist Sync API response (json:"fileurl" tag at line 125) with no validation. Call sites in Trello migration…

Published by the source

25 Mar 2026, 21:14 UTC

Last modified by the source

25 Mar 2026, 21:14 UTC

Source last checked

26 Oct 2026, 15:18 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-g66v-54v9-52pr

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# Patch Next advisory brief: CVE-2026-33675

Advisory: Vikunja has SSRF via Todoist/Trello Migration File Attachment URLs that Allows Reading Internal Network Resources
IDs: CVE-2026-33675, GHSA-g66v-54v9-52pr
Record: https://patchnext.com/advisories/cve-2026-33675 (revision 1, source checked 26 Oct 2026, 15:18 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: code.vikunja.io/api 2.2.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go code.vikunja.io/api: affected <= 2.2.0; fixed in 2.2.1

## Suggested inspection (read-only)
- Go code.vikunja.io/api: check the installed version with your package manager.

## 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 code.vikunja.io/api.
- 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://github.com/advisories/GHSA-g66v-54v9-52pr (GitHub-reviewed advisory GHSA-g66v-54v9-52pr lists affected ranges: Go code.vikunja.io/api >=0 <=2.2.0)

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