CVE-2026-34121: An authentication bypass vulnerability within the HTTP handling of the DS configuration service in TP-Link Tap

Q: How do I fix CVE-2026-34121?

tapo c520ws firmware: upgrade to 1.2.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-34121 being exploited?

CVE-2026-34121 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34121 affect?

CVE-2026-34121 affects tapo c520ws firmware. Severity is high (CVSS 8.8). 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. A

This month

HIGH 8.8UPGRADE

CVE-2026-34121 is a high-severity flaw (CVSS 8.8) affecting tapo c520ws firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-04-02
Last modified	2026-07-24

Publisher (CNA): TPLink · Vendor: tp-link

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 18:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

tp-link tapo c520ws firmware UPGRADE

Affected: < 1.2.4

Fixed in: 1.2.4

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34121?

tapo c520ws firmware: upgrade to 1.2.4. Exact commands for each OS are on this page.

Is CVE-2026-34121 being exploited?

CVE-2026-34121 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34121 affect?

CVE-2026-34121 affects tapo c520ws firmware. Severity is high (CVSS 8.8). 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. A

How urgent is CVE-2026-34121?

Priority 40/100. High severity

Software pages

TP-Link vulnerabilities

Related CVEs

CVE-2026-8714 MEDIUM 6.5 UPGRADE A denial-of-service vulnerability exists in the RTSP server component of TP-Link Tapo C520WS v2 due to imprope
CVE-2026-34118 MEDIUM 6.5 UPGRADE A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C100/C101 v5, C210 v3.6 and C520WS v
CVE-2026-34124 MEDIUM 6.5 UPGRADE A denial-of-service vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP request path pars
CVE-2026-34122 MEDIUM 6.5 UPGRADE A stack-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within a configuration
CVE-2026-34119 MEDIUM 6.5 UPGRADE A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP parsing

References

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