Media

October CMS has Stored XSS in Event Log Mail Preview

Publicada: 14.04.2026
Actualizado: 11.10.2026 10:22

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

Software afectado

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Plataforma	Paquete	Versiones vulnerables	Corregida en
Paquete de Composer	october/system	>= 4.0.0, < 4.1.10, < 3.7.14	4.1.10, 3.7.14

Referencias

Puntuación CVSS 5.4/10

Vector CVSS: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Debilidad (CWE): CWE-79
Plataforma: Composer
Paquete: october/system
Publicada: 14.04.2026
Actualizado: 11.10.2026 10:22

Fuentes y licencias

OSV / GitHub Advisory Database - GHSA-j4j5-9x6g-rgxc - CC BY 4.0

Historial de vulnerabilidades: october/system

Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.

Todas (25) en el archivo

Entradas en total: 25
Primera → última: 06.2020 09.2026
Sin corrección: 0
Explotada en ataques: 1

Distribución por gravedad

Crítica 1
Alta 8
Media 9
Baja 7

Divulgaciones por año

2020: 1
2021: 3
2022: 6
2023: 3
2024: 2
2025: 1
2026: 9

14.04.2026

October CMS has Stored XSS in Event Log Mail Preview esta entrada

Media · 5.4 CVE-2026-24907 >= 4.0.0, < 4.1.10, < 3.7.14 4.1.10, 3.7.14
29.11.2023

October CMS safe mode bypass using Twig sandbox escape

Crítica · 9.1 CVE-2023-44382 >= 3.0.0, < 3.4.15 3.4.15
13.10.2022

October CMS Safe Mode bypass leads to authenticated Remote Code Execution

Alta · 7.2 CVE-2022-35944 >= 2.0.0, < 2.2.34, >= 3.0.0, < 3.0.66 2.2.34, 3.0.66
13.07.2022

October CMS upload process vulnerable to RCE via Race Condition

Alta · 8.1 CVE-2022-24800 < 1.0.476, >= 1.1.0, < 1.1.12, >= 2.0.0, < 2.2.15 1.0.476, 1.1.12, 2.2.15
23.02.2022

Authenticated remote code execution in October CMS

Alta · 7.2 CVE-2022-21705 < 1.0.474, >= 1.1.0, < 1.1.10, >= 2.0.0, < 2.1.27 1.0.474, 1.1.10, 2.1.27
14.01.2022

october/system arbitrary code execution

Alta · 8.8 CVE-2021-32650 >= 1.1.0, < 1.1.6, < 1.0.473 1.1.6, 1.0.473
14.01.2022

October/System authenticated file write leads to remote code execution

Alta · 8.8 CVE-2021-32649 >= 1.1.0, < 1.1.6, < 1.0.473 1.1.6, 1.0.473
06.10.2021

Deleted Admin Can Sign In to Admin Interface

Alta · 7.2 CVE-2021-41126 >= 2.1.0, < 2.1.12 2.1.12
30.08.2021

October CMS auth bypass and account takeover

Alta · 7.4 CVE-2021-29487 < 1.0.472, >= 1.1.1, < 1.1.5 1.0.472, 1.1.5
30.08.2021

Account Takeover in Octobercms

Alta · 8.2 Explotada en ataques CVE-2021-32648 < 1.0.472, >= 1.1.1, < 1.1.5 1.0.472, 1.1.5

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