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Advisory record · GHSA-9wcp-79g5-5c3c

Appsmith Super User Creation Race Condition Allows Multiple Instance Administrators

CVSS 8.1 High

Published by the GitHub Advisory Database at 12 Jun 2026, 18:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.appsmith:serverMaven<1.991.99
Identifiers
GHSA-9wcp-79g5-5c3c
Weakness (CWE)
CWE-367
Tags
Published
12 Jun 2026
Updated
12 Jun 2026

Machine-written summary

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

Appsmith server (Maven com.appsmith:server) versions before 1.99 are affected. An unauthenticated attacker who sends multiple concurrent requests to the super user creation endpoint during initial setup, before the instance has an administrator, can bypass the one-administrator restriction and obtain Instance Administrator privileges. Upgrade to version 1.99 or later.

Written 3 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
8.1 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.