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Advisory record · GHSA-rr73-568v-28f8

Grav Vulnerable to Administrative Account Disruption and Privilege De-escalation via User Overwrite Logic

CVSS 8.1 HighEPSS 0.0046 · 40th percentile

Published by the GitHub Advisory Database at 5 May 2026, 21:29 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
getgrav/gravPackagist<2.0.0-beta.22.0.0-beta.2
Identifiers
GHSA-rr73-568v-28f8 · CVE-2026-42609 · PKSA-fchw-jdvj-kg96
Weakness (CWE)
CWE-269 · CWE-285 · CWE-639 · CWE-837
Tags
Published
5 May 2026
Updated
10 Sept 2026

Machine-written summary

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

Grav (Packagist getgrav/grav) versions before 2.0.0-beta.2 let a low-privileged user who has only user-creation permissions overwrite an existing account by submitting its username through the add-user form, including the primary administrator's account. An attacker with that permission can downgrade the administrator's permissions and lock real admins out, so the source describes this as denial of service on administrative functions. Upgrade to 2.0.0-beta.2, which tightens the uniqueness check so existing usernames are rejected.

Written 31 Oct 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:L/PR:L/UI:N/S:U/C:N/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0046, the 40th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:01 UTC First seen by agentprime
  2. 31 Oct 2026, 14:01 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.