What is CVE-2026-76985?

CVE-2026-76985 is a medium-severity vulnerability in Apache Wicket, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-08-31.

How severe is CVE-2026-76985?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Apache Wicket

CVE-2026-76985

Improper neutralization of input during web page generation in Apache Wicket. org.apache.wicket.extensions.markup.html.form.palette.component.AbstractOptions, which renders the two option lists of a Palette, escapes the id and the display value of each option according to the escape-model-strings setting, and wrote the attribute names and values returned by getAdditionalAttributes into the <option> tag as they came. An application is affected where it overrides Palette.getAdditionalAttributesForChoices, Palette.getAdditionalAttributesForSelection or AbstractOptions.getAdditionalAttributes and returns a value holding data an attacker can influence. These methods return null by default, so an application that does not override them is not affected. As a workaround, escape the values in the override. This issue affects Apache Wicket: from 8.0.0 through 8.18.0, from 9.0.0 through 9.23.0, from 10.0.0 through 10.10.0. Older, unsupported releases from 1.4.0 onwards are also affected. Users are recommended to upgrade to version 8.19.0, 9.24.0 or 10.11.0, which fix the issue.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-08-31 · last modified 2026-09-01.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (41.8th percentile), scored 2026-10-16.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

lists.apache.org/thread/0x2x12x22ff4yq4rhqokb2fjhtsd0f0j (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-76985?: CVE-2026-76985 is a medium-severity vulnerability in Apache Wicket, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-08-31.
How severe is CVE-2026-76985?: Medium severity. CVSS v3 base score is 5.4 out of 10.