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  4. CVE 2026 34121 authentication bypass in ds configuration service
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Back to active CVEs
High · CVSS 8.7CVE-2026-34121

Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210CVE-2026-34121

Answer in brief

CVE-2026-34121 records a High severity (CVSS 8.7) vulnerability in Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210. The current sources do not mark it as known exploited. The current feed maps TP Link Systems Inc./Tapo C210 v3.6 (generic), TP-Link Systems Inc./Tapo C520WS v2.6 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 2, 2026Updated Nov 2, 2026Source checked Nov 2, 2026First seen by HOL Nov 2, 2026Material review Nov 2, 2026
Upstream Advisory

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-287
Source
CVE List V5
Source checked
Nov 2, 2026
References
4 linked sources
Open source record

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TP Link Systems Inc./Tapo C210 v3.6 (generic), TP-Link Systems Inc./Tapo C520WS v2.6 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
TP Link Systems Inc./Tapo C210 v3.6generic>=0 <1.2.7 Build 260818 Rel.64715n1.2.7 Build 260818 Rel.64715n, 1.2.7
TP-Link Systems Inc./Tapo C520WS v2.6generic>=0 <1.2.4 Build 260326 Rel.24666n1.2.4 Build 260326 Rel.24666n, 1.2.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for TP Link Systems Inc./Tapo C210 v3.6, TP-Link Systems Inc./Tapo C520WS v2.6.
  2. 2Review the reported fix. Update TP Link Systems Inc./Tapo C210 v3.6 to 1.2.7 Build 260818 Rel.64715n; TP-Link Systems Inc./Tapo C520WS v2.6 to 1.2.4 Build 260326 Rel.24666n if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Apr 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 2, 2026

Sources and claim methodology

  • Source referencetp-link.com
  • Source referencetp-link.com
  • Source referencetp-link.com
  • Source referencetp-link.com
Upstream source description

An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tapo C520WS v2.6 and C210 v3 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.

Quoted source text, attributed separately from HOL analysis.