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CVE-2025-66299

Getgrav Grav remote code execution

8.8 HIGHPublic exploitEPSS 0.61%
  1. Published1 Dec 2025

Description

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, Grav CMS is vulnerable to a Server-Side Template Injection (SSTI) that allows any authenticated user with editor permissions to execute arbitrary code on the remote server, bypassing the existing security sandbox. Since the security sandbox does not fully protect the Twig object, it is possible to interact with it (e.g., call methods, read/write attributes) through maliciously crafted Twig template directives injected into a web page. This allows an authenticated editor to add arbitrary functions to the Twig attribute system.twig.safe_filters, effectively bypassing the Grav CMS sandbox. This vulnerability is fixed in 1.8.0-beta.27.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Getgrav Grav< 1.8.0 · 1.8.0

Remediation

Fixed in
Getgrav Grav≥ 1.8.0

References

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Frequently asked

Is CVE-2025-66299 being actively exploited?

CVE-2025-66299 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.61%.

How severe is CVE-2025-66299?

CVE-2025-66299 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2025-66299?

Affected products include Getgrav Grav.

How do I fix CVE-2025-66299?

Upgrade affected software to a fixed version, for example Getgrav Grav 1.8.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66299 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.