CVE-2026-34121
Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS
Description
An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 was identified, due to inconsistent parsing and authorization logic in JSON requests during authentication check. An unauthenticated attacker can append an authentication-exempt action to a request containing privileged DS do actions, bypassing authorization checks. Successful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state.
INFO
Published Date :
April 2, 2026, 6:16 p.m.
Last Modified :
April 6, 2026, 8:24 p.m.
Remotely Exploit :
No
Source :
f23511db-6c3e-4e32-a477-6aa17d310630
Affected Products
The following products are affected by CVE-2026-34121
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 | ||||
| CVSS 4.0 | HIGH | f23511db-6c3e-4e32-a477-6aa17d310630 |
Solution
- Update device firmware to the latest version.
- Verify authentication logic in HTTP requests.
- Restrict access to the DS configuration service.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34121.
| URL | Resource |
|---|---|
| https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes | Release Notes |
| https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes | Release Notes |
| https://www.tp-link.com/us/support/faq/5047/ | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34121 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34121
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34121 vulnerability anywhere in the article.
-
CybersecurityNews
Multiple TP-Link Vulnerabilities Let Attackers Trigger DoS and Crash Routers
Multiple high-severity vulnerabilities exist in TP-Link’s Tapo C520WS smart security cameras. If exploited, these vulnerabilities may allow adjacent attackers to trigger Denial-of-Service (DoS) condit ... Read more
-
Daily CyberSecurity
Smart Home Alert: Critical Flaws Exposed in TP-Link Tapo Security Cameras
A security advisory from TP-Link have exposured a series of high-severity vulnerabilities—ranging from CVE-2026-34118 to CVE-2026-34124—affecting the Tapo C520WS v2.6 outdoor security camera. With CVS ... Read more
The following table lists the changes that have been made to the
CVE-2026-34121 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration AND OR *cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.2.4 OR cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:* Added Reference Type TPLink: https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes Types: Release Notes Added Reference Type TPLink: https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes Types: Release Notes Added Reference Type TPLink: https://www.tp-link.com/us/support/faq/5047/ Types: Vendor Advisory -
New CVE Received by f23511db-6c3e-4e32-a477-6aa17d310630
Apr. 02, 2026
Action Type Old Value New Value Added Description An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 was identified, due to inconsistent parsing and authorization logic in JSON requests during authentication check. An unauthenticated attacker can append an authentication-exempt action to a request containing privileged DS do actions, bypassing authorization checks. Successful exploitation allows unauthenticated execution of restricted configuration actions, which may result in unauthorized modification of device state. Added CVSS V4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-287 Added Reference https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes Added Reference https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes Added Reference https://www.tp-link.com/us/support/faq/5047/