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Advisory record · GHSA-2g7h-7rqr-9p4r

Vikunja has iCalendar Property Injection via CRLF in CalDAV Task Output

CVSS 4.1 MediumEPSS 0.0020 · 10th percentile

Published by the GitHub Advisory Database at 10 Apr 2026, 15:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
code.vikunja.io/apiGo<2.3.02.3.0
Identifiers
GHSA-2g7h-7rqr-9p4r · CVE-2026-35601 · GO-2026-4951
Weakness (CWE)
CWE-93
Tags
Published
10 Apr 2026
Updated
8 Jun 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Vikunja (Go module code.vikunja.io/api) versions before 2.3.0 are affected. An authenticated user with write access to a shared project can create a task whose title contains line-break characters, which the CalDAV output does not escape. When other users sync that project over CalDAV, injected iCalendar properties such as ATTACH, VALARM or ORGANIZER can take effect in their calendar clients. Upgrade to version 2.3.0 or later.

Written 7 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
4.1 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 10th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:08 UTC First seen by agentprime
  2. 31 Oct 2026, 15:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.