# Vikunja information disclosure in task assignees endpoint

Source: https://junglewise.ai/threats/go-2026-6723-vikunja-assignee-email-addresses-disclosed-to-read-only-e328c145  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-19. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

Severity: info · Published 2026-10-19

Vikunja is a project management and task-tracking application. A flaw in the task assignees endpoint allows read-only project members to retrieve the email addresses of task assignees, which should remain hidden from users with limited permissions. This leaks sensitive contact information that could be used for targeted phishing or social engineering attacks.

Technologies: [code.vikunja.io/api (Go)](https://junglewise.ai/threats/technologies/code-vikunja-io-api), [Vikunja API](https://junglewise.ai/threats/technologies/vikunja-api). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Vikunja](https://junglewise.ai/threats/vendors/vikunja).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Informational severity, published 19 October 2026.

**Which products and versions are affected?** code.vikunja.io/api (Go) SEMVER:introduced=0; Vikunja API before 2.6.0.

**Is there a fix for This vulnerability?** Yes: fixed in 2.6.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is This vulnerability attacked?** It is attacked over the network, in a software library.

**Am I affected?** Check whether you run code.vikunja.io/api (Go) or Vikunja API at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 2.6.0

## Technical details

The TaskAssignee.ReadAll method in pkg/models/task_assignees.go returns user objects without blanking the Email field, disclosing assignee email addresses to any principal with task.CanRead permission. The vulnerability affects the GET /api/v1/tasks/{id}/assignees and /api/v2/tasks/{id}/assignees endpoints; other similar endpoints correctly obfuscate the email field, indicating this is an oversight rather than design. An authenticated read-only project member can query the endpoint to extract email addresses.

## Affected products

- Vikunja API before 2.6.0

## Identifiers

- GHSA-8wvg-r2j4-3737
- GO-2026-6723

## Timeline

- 2026-08-31: disclosed
- 2026-08-31: patched: v2.6.0 released

## References

- [https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8wvg-r2j4-3737](https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8wvg-r2j4-3737)
- [https://github.com/go-vikunja/vikunja/pull/3688](https://github.com/go-vikunja/vikunja/pull/3688)

## Related threats

- [Vikunja CalDAV relation creation bypasses authorization](https://junglewise.ai/threats/go-2026-6732-vikunja-caldav-relation-creation-bypasses-taskrelation-65a4724c)
- [Vikunja task relation deletion missing authorization check](https://junglewise.ai/threats/go-2026-6754-vikunja-task-relation-deletion-does-not-check-read-access-9f93429b)
- [Vikunja cross-project task disclosure through subtask expansion](https://junglewise.ai/threats/go-2026-6714-vikunja-cross-project-task-disclosure-through-subtask-cba3685c)
- [Vikunja permissive CORS configuration account takeover](https://junglewise.ai/threats/cve-2026-111922-vikunja-from-2-2-0-before-2-7-0-contains-a-permissive-cors)
- [Vikunja incorrect authorization in link share deletion](https://junglewise.ai/threats/cve-2026-111921-vikunja-0-13-0-before-2-7-0-contains-an-incorrect-authorization)