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CVE-2026-58655· NVD / CVE Program· CNA VulnCheck

Grav Flex Objects - Server-Side Template Injection via Dynamic Titles

The bundled Grav Flex Objects plugin (getgrav/grav-plugin-flex-objects) before 1.4.0 contains a stored server-side template injection vulnerability. When rendering dynamic collection or object titles, the plugin passes user-controlled frontmatter values (page.header.flex.collection.title or page.header.flex.object.title) to Twig's template_from_string(), causing them to be evaluated as Twig code rather than treated as text. This path bypasses Grav's Security::cleanDangerousTwig() sanitization. An attacker who can control the title frontmatter of a publicly reachable Flex Objects page can achieve arbitrary Twig execution and escalate to remote command execution via access to internal Grav services such as the scheduler.

HighCVSS 8.7 · v4.0—No exploit Fix available
Published
Jul 15, 2026
Updated
Jul 28, 2026
EPSS
1.1% · 65th percentile
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Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
8.7
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • getgrav grav

    • 1.4.0not affected
    • before 1.4.0affected · semver

Same product

getgrav: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-27921Grav File Upload Path Traversal vulnerability
    53Plan
  • CVE-2024-34082Grav Arbitrary File Read to Account Takeover
    40Plan
  • CVE-2025-46199Cross Site Scripting vulnerability in grav v.1.7.48 and before allows an attacker to execute arbitrary code via a crafted script to the form
    39Monitor
  • CVE-2026-65008Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData
    38Monitor
  • CVE-2021-47812GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2)
    38Monitor
  • CVE-2026-80204Grav before 1.0.18 Authentication Bypass via Scoped API Key
    37Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
getgrav grav1.4.0Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-650086 days apartGrav before 2.0.7 Remote Code Execution via Blueprint dynamicData
    38Monitor
  • CVE-2026-7582734 days apartGrav before 2.0.15 Arbitrary File Write via error_log
    37Monitor
  • CVE-2026-4260765 days apartGrav: Remote Code Execution (RCE) via Malicious Plugin ZIP Upload in Direct Install Feature
    37Monitor
  • CVE-2025-66299226 days apartSecurity Sandbox Bypass with SSTI (Server Side Template Injection) in the Grav CMS
    35Monitor
  • CVE-2025-66294226 days apartGrav is vulnerable to RCE via SSTI through Twig Sandbox Bypass
    35Monitor
  • CVE-2026-6908819 days apartGrav CMS 2.0.7 through 2.0.10 Arbitrary Method Invocation via Blueprint
    34Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

  • CVE-2026-622321 days apartGrav < 2.0.4 2FA Bypass via Secret Regeneration
    36Monitor
  • CVE-2026-623861 days apartGrav < 1.0.0-rc.16 Authentication Bypass via token URL Parameter
    32Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-94 · Improper Control of Generation of Code ('Code Injection')

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records