How severe is CVE-2026-23811?

CVE-2026-23811 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-23811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23811?

CVE-2026-23811 primarily affects Arubanetworks Arubaos. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-23811?

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

Does CVE-2026-23811 have an EU (EUVD) identifier?

Yes. CVE-2026-23811 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9417.

When was CVE-2026-23811 published?

CVE-2026-23811 was published on 2026-03-04 and last updated on 2026-06-17.

CVE-2026-23811

CVE-2026-23811 is a medium-severity vulnerability in Arubanetworks Arubaos with a CVSS 3.x base score of 4.3. 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-300.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9417
Weakness: CWE-300
Affected product: Arubanetworks Arubaos
Published: 2026-03-04
Last modified: 2026-06-17

Description

A vulnerability in the client isolation mechanism may allow an attacker to bypass Layer 2 (L2) communication restrictions between clients and redirect traffic at Layer 3 (L3). In addition to bypassing policy enforcement, successful exploitation - when combined with a port-stealing attack - may enable a bi-directional Machine-in-the-Middle (MitM) attack.

Frequently asked questions

What is CVE-2026-23811?: A vulnerability in the client isolation mechanism may allow an attacker to bypass Layer 2 (L2) communication restrictions between clients and redirect traffic at Layer 3 (L3). In addition to bypassing policy enforcement, successful exploitation - when combined with a port-stealing attack - may enable a bi-directional Machine-in-the-Middle (MitM) attack.
How severe is CVE-2026-23811?: CVE-2026-23811 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-23811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23811?: CVE-2026-23811 primarily affects Arubanetworks Arubaos. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-23811?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23811 have an EU (EUVD) identifier?: Yes. CVE-2026-23811 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9417.
When was CVE-2026-23811 published?: CVE-2026-23811 was published on 2026-03-04 and last updated on 2026-06-17.

References

https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05026en_us&docLocale=en_US

Affected products (2)

cpe:2.3:o:arubanetworks:arubaos:*:*:*:*:*:*:*:*
cpe:2.3:o:arubanetworks:arubaos:10.8.0.0:*:*:*:*:*:*:*

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