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CVE-2026-8699: Stored Cross-Site Scripting (XSS) in TP-Link Archer C5 Web Management Interface
- Severity: high (CVSS 7.0 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-02 · updated 2026-10-25
- Weakness: CWE-79
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.
Affected products
- TP-Link Systems Inc. Archer C5 v6.8: before 0.2.0 3.0.0 v6063.0 Build 260331 Rel.37416n — fixed in 0.2.0 3.0.0 v6063.0 Build 260331 Rel.37416n
How to fix
Upgrade to a fixed version: TP-Link Systems Inc. Archer C5 v6.8 0.2.0 3.0.0 v6063.0 Build 260331 Rel.37416n. Check the vendor advisory for mitigations.
References
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