CVE-2026-76984Network attack vector

Cross-site scripting via unescaped header attribute values

Published Aug 31, 2026 · Updated Aug 31, 2026

Cross-site scripting in affected Apache Wicket releases allows remote authenticated users to execute script in users' browsers. MetaDataHeaderItem replaces double quotes in addTagAttribute, forMetaTag, and forLinkTag values with backslash-quote, which does not escape HTML and lets the quote terminate its attribute. Exploitation requires an application to pass attacker-influenced data through one of those APIs and a user to load the generated page; the resulting script runs in that user's browser context.

CVSS severity5.1
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in affected Apache Wicket releases allows remote authenticated users to execute script in users' browsers. MetaDataHeaderItem replaces double quotes in addTagAttribute, forMetaTag, and forLinkTag values with backslash-quote, which does not escape HTML and lets the quote terminate its attribute. Exploitation requires an application to pass attacker-influenced data through one of those APIs and a user to load the generated page; the resulting script runs in that user's browser context.

The record

CVE
CVE-2026-76984
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
The Apache Software Foundation
Product
Apache Wicket
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <=10.10.0
  2. Affected versionversion=8.0.0 <=8.18.0
  3. Affected versionversion=9.0.0 <=9.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Wicketversion=10.0.0 <=10.10.0; version=8.0.0 <=8.18.0; version=9.0.0 <=9.23.0

Published CVSS scores

5.1CISA-ADPCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo