CVE-2025-66844Network attack vector

Server-side request forgery via undefined Twig functions

Published Dec 15, 2025 · Updated Dec 15, 2025

Server-side request forgery in Grav before 1.7.49.5 allows remote attackers to make server-originated requests through Twig templates. When the configuration registers undefined PHP functions, crafted template expressions invoke request-capable PHP functions with attacker-selected destinations. Exposure requires Twig-enabled page processing and the permissive undefined-function setting, enabling access to network destinations reachable by the server.

CVSS severity9.1
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Grav before 1.7.49.5 allows remote attackers to make server-originated requests through Twig templates. When the configuration registers undefined PHP functions, crafted template expressions invoke request-capable PHP functions with attacker-selected destinations. Exposure requires Twig-enabled page processing and the permissive undefined-function setting, enabling access to network destinations reachable by the server.

The record

CVE
CVE-2025-66844
Published
Dec 15, 2025
Updated
Dec 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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