Threat Intelligence / CVE / CVE-2026-56700

CVE-2026-56700 — Grav

CVSS v3.1 9.8 (CRITICAL) · CVSS v4.0 9.3 · EPSS 1.6% (higher than 74.1% of all scored CVEs) · Priority 7.9/10 · Published 2026-06-30

As of 2026-07-01, CVE-2026-56700 is a CRITICAL-severity vulnerability in Grav, CVSS v3.1 9.8, EPSS 1.6% (74.1th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-56700 as of 2026-07-01; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

Last updated: 2026-07-01

What is CVE-2026-56700?

Grav CMS before 2.0.0-beta.2 contains multiple code-execution vulnerabilities. Three unsafe unserialize() calls - in Scheduler\JobQueue, Framework\Cache\Adapter\FileCache, and Session - deserialize untrusted data without restricting allowed classes, enabling PHP object injection and, via a gadget chain, arbitrary code execution where an attacker controls the serialized input. Additionally, InstallCommand's git clone operation passes the branch, url, and path parameters into a shell command without escaping, allowing OS command injection via plugin/theme installation (which requires admin access). A Twig security blocklist bypass (server-side template injection) is also present. The issues are fixed in 2.0.0-beta.2.

The record classifies CVE-2026-56700 under weakness classes CWE-78, CWE-502. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 80 days ago.

Severity and exploitation probability

CVSS v3.1 base score: 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 base score: 9.3
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
EPSS (FIRST): 1.6% probability of exploitation in the next 30 days, higher than 74.1% of all scored CVEs
CISA KEV: Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority: 7.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published: 2026-06-30, last modified 2026-07-01

Is CVE-2026-56700 being exploited?

It currently carries a trending score of 48 in the Threadlinqs vulnerability feed.

Affected products and versions

Grav: Grav

How to fix CVE-2026-56700

No vendor patch reference has been recorded for CVE-2026-56700 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-56700

No threat campaign in the Threadlinqs corpus currently references CVE-2026-56700, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-02. This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

github.com — vendor advisory

Third-party advisory

vulncheck.com — third party advisory

Full detection coverage & IOCs for threats exploiting CVE-2026-56700 are available via the Threadlinqs MCP server (Purple tier). View plans →

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