Vulnerability-Lookup

CVE-2026-79774 (GCVE-0-2026-79774)

Vulnerability from cvelistv5 – Published: 2026-08-25 15:16 – Updated: 2026-08-26 16:11

Title

Winter CMS before 1.2.13 Twig Sandbox Escape via SecurityPolicy

Summary

Winter CMS versions before 1.2.13 contain an incomplete fix for a Twig sandbox escape vulnerability in System\\Twig\\SecurityPolicy that allows authenticated backend users with template-editing permissions to bypass sandbox restrictions. Attackers can exploit method forwarding through Eloquent models and query builders using methods like saveQuietly(), deleteQuietly(), increment(), decrement(), and newQuery() to read and modify arbitrary database records, execute arbitrary SQL, and achieve remote code execution by injecting PHP into template code sections.

Severity

9.3 (Critical)


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

8.4 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-26 15:57 UTC

CWE

CWE-693 - Protection Mechanism Failure

Assigner

VulnCheck mitre root

References

3 references

URL	Tags
https://github.com/wintercms/winter/security/advi…	vendor-advisory
https://github.com/wintercms/winter/commit/725bbc…	patch
https://www.vulncheck.com/advisories/winter-cms-b…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
wintercms	winter	Affected: 1.2.7 , < 1.2.13 (semver) Unaffected: 1.2.13 (semver) cpe:2.3:a:wintercms:winter::::::::

Date Public

2026-08-07 00:00

Credits

M9nx

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-79774

Vulnerability from fkie_nvd - Published: 2026-08-25 16:17 - Updated: 2026-08-26 17:17

Severity

8.4 (High) - CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/wintercms/winter/commit/725bbcda232466f7f71381c271c6916573d576e6
	disclosure@vulncheck.com	https://github.com/wintercms/winter/security/advisories/GHSA-8cfw-pcwh-v63w
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/winter-cms-before-twig-sandbox-escape-via-securitypolicy

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-GW97-553P-FP3J

Vulnerability from github – Published: 2026-08-25 18:31 – Updated: 2026-08-25 18:31

Details

Winter CMS versions before 1.2.13 contain an incomplete fix for a Twig sandbox escape vulnerability in System\Twig\SecurityPolicy that allows authenticated backend users with template-editing permissions to bypass sandbox restrictions. Attackers can exploit method forwarding through Eloquent models and query builders using methods like saveQuietly(), deleteQuietly(), increment(), decrement(), and newQuery() to read and modify arbitrary database records, execute arbitrary SQL, and achieve remote code execution by injecting PHP into template code sections.

Severity

8.4 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

9.3 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-79774"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-693"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-25T16:17:29Z",
    "severity": "CRITICAL"
  },
  "details": "Winter CMS versions before 1.2.13 contain an incomplete fix for a Twig sandbox escape vulnerability in System\\\\Twig\\\\SecurityPolicy that allows authenticated backend users with template-editing permissions to bypass sandbox restrictions. Attackers can exploit method forwarding through Eloquent models and query builders using methods like saveQuietly(), deleteQuietly(), increment(), decrement(), and newQuery() to read and modify arbitrary database records, execute arbitrary SQL, and achieve remote code execution by injecting PHP into template code sections.",
  "id": "GHSA-gw97-553p-fp3j",
  "modified": "2026-08-25T18:31:54Z",
  "published": "2026-08-25T18:31:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wintercms/winter/security/advisories/GHSA-8cfw-pcwh-v63w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79774"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wintercms/winter/commit/725bbcda232466f7f71381c271c6916573d576e6"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/winter-cms-before-twig-sandbox-escape-via-securitypolicy"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-79774 (GCVE-0-2026-79774)

FKIE_CVE-2026-79774

GHSA-GW97-553P-FP3J

Tags

Sightings

Nomenclature