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Advisory record · GHSA-6rvj-qwjf-3m4q

Vikunja: Every /api/v2 pre-auth endpoint is unthrottled on a stock install while its /api/v1 twin is rate limited

CVSS 8.7 HighEPSS 0.0063 · 50th percentile

Published by the GitHub Advisory Database at 9 Oct 2026, 20:51 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-6rvj-qwjf-3m4q · CVE-2026-91972 · GO-2026-6721
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 versions before 2.6.0 do not apply the pre-auth rate limit to their v2 public API routes, such as login, registration, password-reset token and OAuth token endpoints, while the equivalent v1 routes are throttled. On a default installation, an unauthenticated network attacker can make unlimited attempts against these endpoints, which enables credential guessing, account enumeration and password-reset flooding. Upgrade to Vikunja 2.6.0 or later. The source gives no workaround other than enabling the global rate limiter, which is off by default.

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 0.0063, the 50th 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.