[NEW] [medium] Apache Wicket: Multiple vulnerabilities

mediumCVE-2026-66390 CVE-2026-66391

A remote, anonymous attacker can exploit multiple vulnerabilities in Apache Wicket to carry out a Cross-Site Scripting attack and to bypass security measures.

CSIRTS triage

vendor: Apache product: Apache Wicket Cross-site scripting Authentication bypass

What: Multiple vulnerabilities allow Cross-Site Scripting and security measure bypass.
Who is affected: Remote, anonymous attackers targeting Apache Wicket deployments.
Urgency: Remediation is medium urgency due to the potential for exploitation.
Action: Update to the latest version of Apache Wicket.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-28
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2547

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-663900.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.
Low exploitation riskCVE-2026-663910.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66390	coverage & exploitation status	NVD · CVE.org
CVE-2026-66391	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Apache Wicket

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-66391: Use of Insufficiently Random Values, Protection Mechanism Failure vulnerability in Apache Wick…nvd · 2026-07-27
mediumCVE-2026-66390: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerabi…nvd · 2026-07-27