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 before 2.3.0. The CalDAV output generator constructs iCalendar VTODO entries by raw string concatenation without applying RFC 5545 TEXT value escaping. This allows attackers to inject arbitrary iCalendar properties by including CRLF sequences in task titles, potentially manipulating calendar data. The vulnerability is resolved in version 2.3.0.
Potential Impact
The vulnerability allows injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER by exploiting improper neutralization of CRLF sequences in user-controlled task titles. This can lead to limited integrity issues within calendar data but does not impact confidentiality or availability. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade to Vikunja version 2.3.0 or later, where this vulnerability is fixed by proper escaping of iCalendar TEXT values. Since the vendor advisory confirms the fix in 2.3.0, applying this official update fully mitigates the issue.
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.
CVSS v3.1
Score 4.1medium
Affected software
pkg:golang/github.com/go-vikunja/vikunjaRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
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 before 2.3.0. The CalDAV output generator constructs iCalendar VTODO entries by raw string concatenation without applying RFC 5545 TEXT value escaping. This allows attackers to inject arbitrary iCalendar properties by including CRLF sequences in task titles, potentially manipulating calendar data. The vulnerability is resolved in version 2.3.0.
Potential Impact
The vulnerability allows injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER by exploiting improper neutralization of CRLF sequences in user-controlled task titles. This can lead to limited integrity issues within calendar data but does not impact confidentiality or availability. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade to Vikunja version 2.3.0 or later, where this vulnerability is fixed by proper escaping of iCalendar TEXT values. Since the vendor advisory confirms the fix in 2.3.0, applying this official update fully mitigates the issue.
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: 04/11/2026, 05:17:41 UTC
Last enriched: 04/18/2026, 14:36:06 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 178
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.