Vulnerability-Lookup

CVE-2026-25133 (GCVE-0-2026-25133)

Vulnerability from cvelistv5 – Published: 2026-04-14 20:47 – Updated: 2026-04-16 13:47

Title

October CMS has Stored XSS via SVG Filter Bypass

Summary

October is a Content Management System (CMS) and web platform. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the SVG sanitization logic. The regex pattern used to strip event handler attributes (such as onclick or onload) could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions. The SVG must be viewed or embedded in a page for the payload to trigger. This issue has been fixed in versions 3.7.14 and 4.1.10.

Severity

4.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/octobercms/october/security/ad…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
octobercms	october	Affected: < 3.7.14 Affected: >= 4.0.0, < 4.1.10

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-25133

Vulnerability from fkie_nvd - Published: 2026-04-14 21:16 - Updated: 2026-06-17 10:24

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/octobercms/october/security/advisories/GHSA-gcqv-f29m-67gr	Vendor Advisory

Impacted products

	Vendor	Product	Version
	octobercms	october	*
	octobercms	october	*

JSON

To clipboard

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GHSA-GCQV-F29M-67GR

Vulnerability from github – Published: 2026-04-14 22:29 – Updated: 2026-05-08 20:41

Summary

October Rain has Stored XSS via SVG Filter Bypass

Details

A stored cross-site scripting (XSS) vulnerability was identified in the SVG sanitization logic. The regex pattern used to strip on* event handler attributes could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries.

Impact

Stored XSS via malicious SVG files uploaded through the Media Manager
Could allow privilege escalation if a superuser views or embeds the malicious SVG
Requires authenticated backend access with media upload permissions (media.library.create)
SVG must be viewed or embedded in a page to trigger

Patches

The vulnerability has been patched in v3.7.14 and v4.1.10. All users are encouraged to upgrade to the latest patched version.

Workarounds

If upgrading immediately is not possible: - Disable SVG uploads by adding svg to the blocked extensions in media configuration - Set media.clean_vectors to true in configuration (enabled by default)

References

Reported by Pentest-Tools.com

Severity

4.8 (Medium)


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

4.8 (Medium)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.9"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "october/rain"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.7.13"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "october/rain"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.7.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25133"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-14T22:29:50Z",
    "nvd_published_at": "2026-04-14T21:16:25Z",
    "severity": "MODERATE"
  },
  "details": "A stored cross-site scripting (XSS) vulnerability was identified in the SVG sanitization logic. The regex pattern used to strip `on*` event handler attributes could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries.\n\n### Impact\n- Stored XSS via malicious SVG files uploaded through the Media Manager\n- Could allow privilege escalation if a superuser views or embeds the malicious SVG\n- Requires authenticated backend access with media upload permissions (`media.library.create`)\n- SVG must be viewed or embedded in a page to trigger\n\n### Patches\nThe vulnerability has been patched in v3.7.14 and v4.1.10. All users are encouraged to upgrade to the latest patched version.\n\n### Workarounds\nIf upgrading immediately is not possible:\n- Disable SVG uploads by adding `svg` to the blocked extensions in media configuration\n- Set `media.clean_vectors` to `true` in configuration (enabled by default)\n\n### References\n- Reported by Pentest-Tools.com",
  "id": "GHSA-gcqv-f29m-67gr",
  "modified": "2026-05-08T20:41:49Z",
  "published": "2026-04-14T22:29:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/octobercms/october/security/advisories/GHSA-gcqv-f29m-67gr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25133"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/octobercms/october"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "October Rain has Stored XSS via SVG Filter Bypass"
}

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.

Action not permitted

CVE-2026-25133 (GCVE-0-2026-25133)

FKIE_CVE-2026-25133

GHSA-GCQV-F29M-67GR

Impact

Patches

Workarounds

References

Tags

Sightings

Nomenclature