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Advisory record · GHSA-m469-88xx-8rx2

Vikunja: CalDAV and feeds BasicAuth endpoints have no rate limit, bypassing the anti-brute-force floor on account passwords

CVSS 8.7 HighEPSS 0.0067 · 52nd percentile

Published by the GitHub Advisory Database at 9 Oct 2026, 20:52 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
code.vikunja.io/apiGo<2.6.02.6.0
Identifiers
GHSA-m469-88xx-8rx2 · CVE-2026-91973 · GO-2026-6737
Weakness (CWE)
CWE-307
Tags
Published
9 Oct 2026
Updated
19 Oct 2026

Machine-written summary

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

Vikunja's CalDAV (/dav, /.well-known) and feeds (/feeds) endpoints, in versions before 2.6.0, accept BasicAuth with the plain account password and have no rate limit. An attacker with network access can make unlimited password guesses against these endpoints, bypassing the rate limit on the login route. Upgrade to Vikunja 2.6.0 or later, which applies the rate limit to these endpoints.

Written 1 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
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0067, the 52nd percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 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.