Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M

CVE-2026-33677Webhook BasicAuth Credentials Exposed to Read-Only Project Collaborators via API

Medium 6.5

In plain English

A medium-severity information exposure in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 76.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, the `GET /api/v1/projects/:project/webhooks` endpoint returns webhook BasicAuth credentials (`basic_auth_user` and `basic_auth_password`) in plaintext to any user with read access to the project. While the existing code correctly masks the HMAC `secret` field, the BasicAuth fields added in a later migration were not given the same treatment. This allows read-only collaborators to steal credentials intended for authenticating against external webhook receivers. Version 2.2.1 patches the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.2.1	GHSA-7c2g-p23p-4jg3
Go	code.vikunja.io/api	no fix listed	GO-2026-4846

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	< 2.2.1

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-7c2g-p23p-4jg3 x_refsource_CONFIRM
https://vikunja.io/changelog/vikunja-v2.2.2-was-released x_refsource_MISC