How severe is CVE-2026-66391?

CVE-2026-66391 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-66391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-66391?

CVE-2026-66391 affects Apache Wicket. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-66391?

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

When was CVE-2026-66391 published?

CVE-2026-66391 was published on 2026-07-27 and last updated on 2026-08-05.

CVE-2026-66391

CVE-2026-66391 is a medium-severity vulnerability in Apache Wicket with a CVSS 3.x base score of 6.5. 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-330.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-330
Affected product: Apache Wicket
Published: 2026-07-27
Last modified: 2026-08-05

Description

Use of Insufficiently Random Values, Protection Mechanism Failure vulnerability in Apache Wicket. This issue affects Apache Wicket: from 9.0.0 through 9.23.0, from 10.0.0 through 10.9.0. Users are recommended to upgrade to version 10.10.0, which fixes the issue.

Frequently asked questions

What is CVE-2026-66391?: Use of Insufficiently Random Values, Protection Mechanism Failure vulnerability in Apache Wicket. This issue affects Apache Wicket: from 9.0.0 through 9.23.0, from 10.0.0 through 10.9.0. Users are recommended to upgrade to version 10.10.0, which fixes the issue.
How severe is CVE-2026-66391?: CVE-2026-66391 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-66391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-66391?: CVE-2026-66391 affects Apache Wicket. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-66391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-66391 published?: CVE-2026-66391 was published on 2026-07-27 and last updated on 2026-08-05.

References

Affected products (1)

cpe:2.3:a:apache:wicket:*:*:*:*:*:*:*:*

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