CVE-2026-8699 Stored Cross-Site Scripting (XSS) in TP-Link Archer C5 Web Management Interface
An attacker with admin privileges can inject JavaScript into the Archer C5 router interface, leading to session hijacking and unauthorized configuration changes.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-8699?
CVE-2026-8699 is a high-severity cross-site scripting vulnerability in TP-Link Systems Inc. Archer C5 v6.8, published on 2 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-8699?
How do I fix CVE-2026-8699?
No fix has been published for CVE-2026-8699 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-8699 being exploited?
There is no known exploitation of CVE-2026-8699 in the wild and no public exploit code.
Sources
Also known as GHSA-2rgg-wpwx-p48p.