CVE-2026-58655Public exploitNetwork attack vector

Authenticated code execution via dynamic title templating

Published Jul 15, 2026 · Updated Jul 15, 2026

Stored template injection in Grav Flex Objects before 1.4.0 allows remote authenticated users to execute server commands. Its frontend Twig templates pass collection or object title frontmatter to template_from_string(), evaluating the title as Twig code instead of text and bypassing dangerous-Twig sanitization. Exploitation requires control of title frontmatter on a publicly reachable Flex Objects page and grants access to files, internal Grav services, and operating-system commands.

CVSS severity8.7
High
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored template injection in Grav Flex Objects before 1.4.0 allows remote authenticated users to execute server commands. Its frontend Twig templates pass collection or object title frontmatter to template_from_string(), evaluating the title as Twig code instead of text and bypassing dangerous-Twig sanitization. Exploitation requires control of title frontmatter on a publicly reachable Flex Objects page and grants access to files, internal Grav services, and operating-system commands.

The record

CVE
CVE-2026-58655
Published
Jul 15, 2026
Updated
Jul 15, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-94, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Gravversion=0 <1.4.0

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

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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