Vulnerability-Lookup

CVE-2026-24907 (GCVE-0-2026-24907)

Vulnerability from cvelistv5 – Published: 2026-04-14 17:34 – Updated: 2026-04-14 19:29

Title

October CMS has Stored XSS via Event Log Mail Preview

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 Event Log mail preview feature. When viewing logged mail messages, HTML content was rendered in an iframe without proper sandboxing, allowing JavaScript execution in the viewer's browser context. This issue has been fixed in versions 3.7.14 and 4.1.10. If users are unable to update immediately, workarounds include restricting mail template editing permissions to fully trusted administrators only and restricting Event Log viewing permissions to minimize exposure.

Severity

5.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-14 19:29 UTC

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	CPE status
octobercms	october	Affected: < 3.7.14 Affected: >= 4.0.0, < 4.1.10	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-24907

Vulnerability from fkie_nvd - Published: 2026-04-14 18:16 - Updated: 2026-06-17 10:23

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/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-j4j5-9x6g-rgxc	Vendor Advisory

Impacted products

	Vendor	Product	Version
	octobercms	october	*
	octobercms	october	*

JSON

To clipboard

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      "affectedData": [
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          "product": "october",
          "vendor": "octobercms",
          "versions": [
            {
              "status": "affected",
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            },
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GHSA-J4J5-9X6G-RGXC

Vulnerability from github – Published: 2026-04-14 20:02 – Updated: 2026-04-24 21:06

Summary

October CMS has Stored XSS in Event Log Mail Preview

Details

A stored cross-site scripting (XSS) vulnerability was identified in the Event Log mail preview feature. When viewing logged mail messages, HTML content was rendered in an iframe without proper sandboxing, allowing JavaScript execution in the viewer's browser context.

Impact

Stored XSS via mail template content rendered in Event Log
Could allow privilege escalation if a superuser views a malicious log entry
Requires authenticated backend access with mail template editing permissions
Requires a superuser to view the specific Event Log entry 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: - Restrict mail template editing permissions to fully trusted administrators only - Restrict Event Log viewing permissions to minimize exposure

References

Reported by Chris Alupului

Severity

5.4 (Medium)


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

5.1 (Medium)


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

Show details on source website

JSON

To clipboard

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        "last_known_affected_version_range": "\u003c= 4.1.9"
      },
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      },
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        }
      ]
    },
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        "last_known_affected_version_range": "\u003c= 3.7.13"
      },
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        "ecosystem": "Packagist",
        "name": "october/system"
      },
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        {
          "events": [
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              "introduced": "0"
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            }
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        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24907"
  ],
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    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-14T20:02:50Z",
    "nvd_published_at": "2026-04-14T18:16:45Z",
    "severity": "MODERATE"
  },
  "details": "A stored cross-site scripting (XSS) vulnerability was identified in the Event Log mail preview feature. When viewing logged mail messages, HTML content was rendered in an iframe without proper sandboxing, allowing JavaScript execution in the viewer\u0027s browser context.\n\n### Impact\n- Stored XSS via mail template content rendered in Event Log\n- Could allow privilege escalation if a superuser views a malicious log entry\n- Requires authenticated backend access with mail template editing permissions\n- Requires a superuser to view the specific Event Log entry 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- Restrict mail template editing permissions to fully trusted administrators only\n- Restrict Event Log viewing permissions to minimize exposure\n\n### References\n- Reported by [Chris Alupului](https://github.com/neosprings)",
  "id": "GHSA-j4j5-9x6g-rgxc",
  "modified": "2026-04-24T21:06:19Z",
  "published": "2026-04-14T20:02:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/octobercms/october/security/advisories/GHSA-j4j5-9x6g-rgxc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24907"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/octobercms/october"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "October CMS has Stored XSS in Event Log Mail Preview"
}

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-2026-24907 (GCVE-0-2026-24907)

FKIE_CVE-2026-24907

GHSA-J4J5-9X6G-RGXC

Impact

Patches

Workarounds

References

Tags

Sightings

Nomenclature