How severe is CVE-2026-4228?

CVE-2026-4228 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-4228 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4228?

CVE-2026-4228 affects Lb-link Bl-wr9000 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4228?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4228 have an EU (EUVD) identifier?

Yes. CVE-2026-4228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12371.

When was CVE-2026-4228 published?

CVE-2026-4228 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-4228

CVE-2026-4228 is a medium-severity vulnerability in Lb-link Bl-wr9000 Firmware with a CVSS 3.x base score of 6.3. 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-77.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 2.1
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12371
Weakness: CWE-77
Affected product: Lb-link Bl-wr9000 Firmware
Published: 2026-03-16
Last modified: 2026-06-17

Description

A vulnerability was detected in LB-LINK BL-WR9000 2.4.9. This affects the function sub_458754 of the file /goform/set_wifi. The manipulation results in command injection. It is possible to launch the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2026-4228?: A vulnerability was detected in LB-LINK BL-WR9000 2.4.9. This affects the function sub_458754 of the file /goform/set_wifi. The manipulation results in command injection. It is possible to launch the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2026-4228?: CVE-2026-4228 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-4228 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4228?: CVE-2026-4228 affects Lb-link Bl-wr9000 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4228?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4228 have an EU (EUVD) identifier?: Yes. CVE-2026-4228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12371.
When was CVE-2026-4228 published?: CVE-2026-4228 was published on 2026-03-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:lb-link:bl-wr9000_firmware:2.4.9:*:*:*:*:*:*:*

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CVE-2023-26801 — Critical (CVSS 9.8): LB-LINK BL-AC1900_2.0 v1.0.1, LB-LINK BL-WR9000 v2.4.9, LB-LINK BL-X26 v1.2.5, and LB-LINK BL-LTE300 v1.0.8 were…
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CVE-2026-4226 — High (CVSS 8.8): A weakness has been identified in LB-LINK BL-WR9000 2.4.9. The affected element is the function sub_44E8D0 of the file…

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