CVE-2026-8699
Stored Cross-Site Scripting (XSS) in TP-Link Archer C5 Web Management Interface
Description
A stored Cross-Site Scripting (XSS) vulnerability has been identified in the web-based management interface of Archer C5 v6.8 routers, due to insufficient server-side validation and lack of proper output encoding of user-controlled input in a certain field. An attacker with administrative privileges can inject crafted HTML or JS payloads into the affected field. The payload is stored and later executed when the affected page is rendered in an administrator's browser.Successful exploitation allows execution of arbitrary JavaScript in an admin's browser, potentially leading to session hijacking and unauthorized access to router configuration, possibly resulting in exposure of sensitive data and modification of device settings. The vulnerability affects ISP-managed firmware variants of the product. Remediation is coordinated through service providers.
INFO
Published Date :
July 2, 2026, 5:17 p.m.
Last Modified :
Oct. 25, 2026, 9:10 p.m.
Remotely Exploit :
No
Source :
f23511db-6c3e-4e32-a477-6aa17d310630
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 | ||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 |
Solution
- Contact your service provider for firmware updates.
- Apply the provided firmware update.
- Ensure proper input validation and output encoding.
- Limit administrative access to trusted users.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-8699.
| URL | Resource |
|---|---|
| https://www.tp-link.com/en/support/faq/5165/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-8699 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-8699
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-8699 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-8699 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: Archer C5 de TP-Link Systems Inc., Description: Una vulnerabilidad de cross-site scripting (XSS) almacenado ha sido identificada en la interfaz de gestión basada en web de los routers Archer C5 v6.8, debido a una validación insuficiente del lado del servidor y la falta de codificación de salida adecuada de la entrada controlada por el usuario en un campo determinado. Un atacante con privilegios administrativos puede inyectar cargas útiles HTML o JS manipuladas en el campo afectado. La carga útil se almacena y se ejecuta posteriormente cuando la página afectada se renderiza en el navegador de un administrador. La explotación exitosa permite la ejecución de JavaScript arbitrario en el navegador de un administrador, lo que podría llevar al secuestro de sesión y acceso no autorizado a la configuración del router, posiblemente resultando en la exposición de datos sensibles y la modificación de la configuración del dispositivo. La vulnerabilidad afecta a las variantes de firmware gestionadas por ISP del producto. La remediación se coordina a través de los proveedores de servicios. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 02, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-8699', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-02T17:23:30.577576Z'} -
New CVE Received by f23511db-6c3e-4e32-a477-6aa17d310630
Jul. 02, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'TP-Link Systems Inc.', 'product': 'Archer C5 v6.8', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.2.0 3.0.0 v6063.0 Build 260331 Rel.37416n', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] Added Description A stored Cross-Site Scripting (XSS) vulnerability has been identified in the web-based management interface of Archer C5 v6.8 routers, due to insufficient server-side validation and lack of proper output encoding of user-controlled input in a certain field. An attacker with administrative privileges can inject crafted HTML or JS payloads into the affected field. The payload is stored and later executed when the affected page is rendered in an administrator's browser.Successful exploitation allows execution of arbitrary JavaScript in an admin's browser, potentially leading to session hijacking and unauthorized access to router configuration, possibly resulting in exposure of sensitive data and modification of device settings. The vulnerability affects ISP-managed firmware variants of the product. Remediation is coordinated through service providers. Added CVSS V4.0 AV:A/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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 Added CWE CWE-79 Added Reference https://www.tp-link.com/en/support/faq/5165/