CVE-2026-66391: apache software foundation apache wicket Use of Insufficiently Random Values
CVSS: 6.5v3.1MediumAnalyzed
Published 27-07-2026Last modified 28-07-2026
Vulnerability summary
CVE-2026-66391 is a medium (CVSS 6.5) Use of Insufficiently Random Values vulnerability in apache software foundation apache wicket. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.4% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)EPSS score
0.64%
0%100%
Low · +0.23 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 27-07-2026PublishedVulnerability first disclosed.
- 28-07-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 2 sources · 1 versionMedium 6.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NSourcesAll 2 agree
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS trend
Probability
0.64%
Chance of exploitation in the next 30 days
Percentile
49%
Versus all other CVEs
30-day change
+0.23 pp
From 0.40% on 18-09-2026
18-09-202618-10-2026
EPSS score0.64%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-330Use of Insufficiently Random ValuesThe product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.
- CWE-693Protection Mechanism FailureThe product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
Affected systems
Apache1 product
- wicket≥ 9.0.0, ≤ 9.23.0 | ≥ 10.0.0, < 10.10.0
Apache software foundation1 product
- apache wicket≥ 9.0.0, ≤ 9.23.0 | ≥ 10.0.0, ≤ 10.9.0
2 vendors · 2 products