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Advisory record · GHSA-qfwc-vx6f-3g6g

Vikunja: Read-only project members can obtain any link share's access hash via the single-share read endpoint (v1 and v2) and escalate to the share's permission level

CVSS 8.7 HighEPSS 0.0043 · 37th 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-qfwc-vx6f-3g6g · CVE-2026-91985 · GO-2026-6747
Weakness (CWE)
CWE-200 · CWE-639 · CWE-862
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.

GHSA-qfwc-vx6f-3g6g affects the Go module code.vikunja.io/api versions before 2.6.0. A user with read-only access to a project can call the single link-share read endpoint (v1 and v2) and receive the share's hash, which can be exchanged for a link-share token carrying the share's permission level, allowing writes the user is not entitled to. Upgrade to version 2.6.0 or later. The source lists no other workaround.

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 0.0043, the 37th 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.