CVE-2026-33668: Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and OpenID Connect
Vulnerability summary
CVE-2026-33668 is a high (CVSS 8.1) Improper Authorization vulnerability in go-vikunja vikunja. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.8% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 24-03-2026PublishedVulnerability first disclosed.
- 26-03-2026Last modifiedVulnerability information updated.
Description
Vikunja is an open-source self-hosted task management platform. Starting in version 0.18.0 and prior to version 2.2.1, when a user account is disabled or locked, the status check is only enforced on the local login and JWT token refresh paths. Three other authentication paths — API tokens, CalDAV basic auth, and OpenID Connect — do not verify user status, allowing disabled or locked users to continue accessing the API and syncing data. Version 2.2.1 patches the issue.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · GoEcosystem advisory · calculated7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- NVDNIST7.1HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS trend
Probability
0.62%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
Increase +0.16 pp
From 0.45% on 22-09-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundVikunja
Maturity: poc
Weaknesses
CWE · root cause- CWE-285Improper AuthorizationThe product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action.
- CWE-863Incorrect AuthorizationThe product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
Affected systems
Code.vikunja.io1 product
- api≥ 0.18.0, < 2.2.1 | ≥ 0.18.0 (No fix recorded)
Go-vikunja1 product
- vikunja≥ 0.18.0, < 2.2.1
Vikunja1 product
- vikunja≥ 0.18.0, < 2.2.1
3 vendors · 3 products
References
8 links- github.com/go-vikunja/vikunja/security/advisories/GHSA-94xm-jj8x-3cr4X Refsource CONFIRMWEBAdvisoryExploitVendor Advisory
- github.com/go-vikunja/vikunja/commit/033922309f492996c928122fb49b691339199c35X Refsource MISCWEBPatch
- github.com/go-vikunja/vikunja/commit/04704e0fde4b027039cf583110cee7afe136fc1bX Refsource MISCWEBPatch
- github.com/go-vikunja/vikunja/commit/0b04768d830c80e9fde1b0962db1499cc652da0eX Refsource MISCWEBPatch
- github.com/go-vikunja/vikunja/commit/fd452b9cb6457fd4f9936527a14c359818f1cca7X Refsource MISCWEBPatch
