Vikunja: Permissive Cross-domain Security Policy trusts every localhost origin which should not be trusted

Exploitation

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

CVSS 4.0

7.2 · CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2026-111922: 0.15% estimated exploitation activity in the next 30 days; percentile 4.20 (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 Vikunja ships with cors.origins defaulting to http://127.0.0.1: and http://localhost:, and sends Access-Control-Allow-Credentials: true, so a page served from any port on the user's own machine may make credentialed cross-origin requests to the API and read the responses. The mandatory service.publicurl is appended to that default list rather than replacing it, so a fully configured production deployment still trusts every localhost origin. Combined with the token refresh endpoint, which authenticates with the vikunjarefreshtoken cookie and returns a bearer JWT in the response body, one fetch() from such a page yields a working access token for whoever is logged in, and from there the whole account. Vulnerability Details cors.enable defaults to true and cors.origins defaults to the two localhost wildcards: https://github.com/go-vikunja/vikunja/blob/a881ac39eecd07575a5aede8e74727c28d5fd578/pkg/config/config.go#L495-L497 The middleware is registered with AllowCredentials: true…

Published by the source

9 Oct 2026, 20:57 UTC

Last modified by the source

19 Oct 2026, 21:40 UTC

Source last checked

26 Oct 2026, 15:32 UTC

1. Revision 4 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-m687-p538-r5hp

2. Revision 3 · amended · 25 Oct 2026

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

3. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6739

4. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-m687-p538-r5hp

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# Patch Next advisory brief: CVE-2026-111922

Advisory: Vikunja: Permissive Cross-domain Security Policy trusts every localhost origin which should not be trusted
IDs: CVE-2026-111922, GHSA-m687-p538-r5hp
Record: https://patchnext.com/advisories/cve-2026-111922 (revision 4, source checked 26 Oct 2026, 15:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go code.vikunja.io/api: affected >= 2.2.0, <= 2.6.0

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

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## 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://osv.dev/vulnerability/GO-2026-6739 (OSV record GO-2026-6739 lists affected ranges: Go code.vikunja.io/api >=0)
- Verified: https://osv.dev/vulnerability/GHSA-m687-p538-r5hp (OSV record GHSA-m687-p538-r5hp lists affected ranges: Go code.vikunja.io/api >=2.2.0 <=2.6.0)
- Verified: https://github.com/advisories/GHSA-m687-p538-r5hp (GitHub-reviewed advisory GHSA-m687-p538-r5hp lists affected ranges: Go code.vikunja.io/api >=2.2.0 <=2.6.0)

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