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Advisory record · GHSA-fmxq-cgp8-87wp

Argo CD: AppProject destination-namespace and resource restrictions bypassed by PreDelete/PostDelete resource hooks

CVSS 9.9 CriticalCriticalEPSS 0.0050 · 42nd percentile

Critical, because:

  • CVSS score 9.9: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 15 Oct 2026, 20:19 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/argoproj/argo-cd/v2Go>=2.10.0, <=2.14.21No fixed version yet
github.com/argoproj/argo-cd/v3Go>=3.0.0, <3.3.15 || >=3.4.0, <3.4.10 || >=3.5.0, <3.5.4 || >=3.6.0-rc1, <3.6.0-rc23.3.15, 3.4.10, 3.5.4, 3.6.0-rc2
Identifiers
GHSA-fmxq-cgp8-87wp · BIT-argo-cd-2026-77459 · CVE-2026-77459 · GO-2026-6784
Weakness (CWE)
CWE-863
Tags
Published
15 Oct 2026
Updated
20 Oct 2026

Machine-written summary

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

Argo CD (github.com/argoproj/argo-cd/v2 versions 2.10.0 through 2.14.21, with no fixed version listed, and github.com/argoproj/argo-cd/v3 versions 3.0.0 through 3.3.14, 3.4.0 through 3.4.9, 3.5.0 through 3.5.3, and 3.6.0-rc1) skips AppProject destination and resource checks for PreDelete and PostDelete hooks. A user who can push to a synced Git repository and then delete the Application can make the controller create arbitrary resources on the destination cluster, using the controller's broad access. Upgrade the v3 line to 3.3.15, 3.4.10, 3.5.4, 3.6.0-rc2 or newer; v2 has no fix listed.

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
9.9 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0050, the 42nd percentile, on 8 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.