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Advisory record · GHSA-vj3m-2g9h-vm4p

Grav has multiple RCE vectors: unsafe unserialize (x3), command injection in git clone, SSTI blocklist bypass

CVSS 9.3 CriticalCriticalEPSS 0.025 · 85th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

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-vj3m-2g9h-vm4p · CVE-2026-56700 · PKSA-vnvp-8nvk-g8ck
Weakness (CWE)
CWE-78 · CWE-502
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 CMS versions before 2.0.0-beta.2 (Packagist getgrav/grav) contain several remote code execution flaws: unsafe unserialize() calls in the scheduler job queue, file cache and session handling, a shell command injection in the CLI git clone step during plugin or theme installation, and an incomplete Twig function blocklist. The source describes the unserialize and Twig issues as reachable with a file write or template injection, and the git clone issue as admin-accessible. Upgrade to 2.0.0-beta.2, which the source says addresses all five items.

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
9.3 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.025, the 85th percentile, on 11 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.