CVE-2026-35601: CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') in go-vikunja vikunja
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV output generator builds iCalendar VTODO entries via raw string concatenation without applying RFC 5545 TEXT value escaping. User-controlled task titles containing CRLF characters break the iCalendar property boundary, allowing injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER. This vulnerability is fixed in 2.3.0.
AI Analysis
Technical Summary
CVE-2026-35601 is a CRLF injection vulnerability in the go-vikunja vikunja task management platform affecting versions prior to 2.3.0. The issue arises from improper neutralization of CRLF sequences (CWE-93) in the CalDAV output generator, which builds iCalendar VTODO entries using raw string concatenation without applying RFC 5545 TEXT value escaping. User-supplied task titles containing CRLF characters can break iCalendar property boundaries, allowing injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER. This vulnerability is resolved in version 2.3.0.
Potential Impact
The vulnerability allows an attacker with the ability to create or modify task titles to inject arbitrary iCalendar properties into the CalDAV output. This could lead to manipulation of calendar data, such as adding unexpected alarms or attachments. There is no direct impact on confidentiality or availability reported. The CVSS score of 4.1 reflects a medium impact primarily on integrity.
Mitigation Recommendations
Upgrade to Vikunja version 2.3.0 or later, where this vulnerability has been fixed by properly escaping CRLF sequences in iCalendar output. Since this is a self-hosted product, administrators should apply the update promptly to remediate the issue. Patch status is confirmed fixed in version 2.3.0.
CVE-2026-35601: CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection') in go-vikunja vikunja
Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV output generator builds iCalendar VTODO entries via raw string concatenation without applying RFC 5545 TEXT value escaping. User-controlled task titles containing CRLF characters break the iCalendar property boundary, allowing injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER. This vulnerability is fixed in 2.3.0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-35601 is a CRLF injection vulnerability in the go-vikunja vikunja task management platform affecting versions prior to 2.3.0. The issue arises from improper neutralization of CRLF sequences (CWE-93) in the CalDAV output generator, which builds iCalendar VTODO entries using raw string concatenation without applying RFC 5545 TEXT value escaping. User-supplied task titles containing CRLF characters can break iCalendar property boundaries, allowing injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER. This vulnerability is resolved in version 2.3.0.
Potential Impact
The vulnerability allows an attacker with the ability to create or modify task titles to inject arbitrary iCalendar properties into the CalDAV output. This could lead to manipulation of calendar data, such as adding unexpected alarms or attachments. There is no direct impact on confidentiality or availability reported. The CVSS score of 4.1 reflects a medium impact primarily on integrity.
Mitigation Recommendations
Upgrade to Vikunja version 2.3.0 or later, where this vulnerability has been fixed by properly escaping CRLF sequences in iCalendar output. Since this is a self-hosted product, administrators should apply the update promptly to remediate the issue. Patch status is confirmed fixed in version 2.3.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-03T21:25:12.162Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d9d9751cc7ad14da3f873b
Added to database: 4/11/2026, 5:17:41 AM
Last enriched: 4/11/2026, 5:19:49 AM
Last updated: 4/11/2026, 2:02:26 PM
Views: 8
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