How severe is CVE-2026-34121?

CVE-2026-34121 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34121 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34121?

CVE-2026-34121 affects Tp-link Tapo C520ws Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34121?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34121 have an EU (EUVD) identifier?

Yes. CVE-2026-34121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18432.

When was CVE-2026-34121 published?

CVE-2026-34121 was published on 2026-04-02 and last updated on 2026-07-24.

CVE-2026-34121

CVE-2026-34121 is a high-severity vulnerability in Tp-link Tapo C520ws Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18432
Weakness: CWE-287
Affected product: Tp-link Tapo C520ws Firmware
Published: 2026-04-02
Last modified: 2026-07-24

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.

Frequently asked questions

What is CVE-2026-34121?: 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.
How severe is CVE-2026-34121?: CVE-2026-34121 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34121 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34121?: CVE-2026-34121 affects Tp-link Tapo C520ws Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34121?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34121 have an EU (EUVD) identifier?: Yes. CVE-2026-34121 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18432.
When was CVE-2026-34121 published?: CVE-2026-34121 was published on 2026-04-02 and last updated on 2026-07-24.

References

Affected products (1)

cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Tp-link Tapo C520ws Firmware

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CVE-2026-34124 — Medium (CVSS 6.5): A denial-of-service vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP request path parsing…
CVE-2026-34122 — Medium (CVSS 6.5): A stack-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within a configuration handling…

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