CVE-2026-33315 | go-vikunja up to 2.1.x Caldav Endpoint authentication bypass

VDB-352792 · CVE-2026-33315 · GCVE-0-2026-33315 GO-VIKUNJA UP TO 2.1.X CALDAV ENDPOINT AUTHENTICATION BYPASS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 1.95+ Summaryinfo A vulnerability was found in go-vikunja vikunja up to 2.1.x. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the component Caldav Endpoint. Executing a manipulation can lead to authentication bypass. This vulnerability is tracked as CVE-2026-33315. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component. Detailsinfo A vulnerability classified as critical was found in go-vikunja vikunja up to 2.1.x. This vulnerability affects some unknown processing of the component Caldav Endpoint. The manipulation with an unknown input leads to a authentication bypass vulnerability. The CWE definition for the vulnerability is CWE-288. A product requires authentication, but the product has an alternate path or channel that does not require authentication. As an impact it is known to affect confidentiality. CVE summarizes: Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.0, the Caldav endpoint allows login using Basic Authentication, which in turn allows users to bypass the TOTP on 2FA-enabled accounts. The user can then access standard project information that would normally be protected behind 2FA (if enabled), such as project name, description, etc. Version 2.2.0 patches the issue. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-33315 since 03/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. Upgrading to version 2.2.0 eliminates this vulnerability. Productinfo Vendor go-vikunja Name vikunja Version 2.0 2.1 Website Product: https://github.com/go-vikunja/vikunja/ CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authentication bypass CWE: CWE-288 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: vikunja 2.2.0 Timelineinfo 03/18/2026 CVE reserved 03/24/2026 +6 days Advisory disclosed 03/24/2026 +0 days VulDB entry created 03/24/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33315 (🔒) GCVE (CVE): GCVE-0-2026-33315 GCVE (VulDB): GCVE-100-352792 Entryinfo Created: 03/24/2026 16:11 Changes: 03/24/2026 16:11 (67) Complete: 🔍 Cache ID: 99:6C3:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸