What is CVE-2026-40105?

CVE-2026-40105 is a medium-severity vulnerability in Xwiki, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-04-15.

How severe is CVE-2026-40105?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Xwiki

CVE-2026-40105

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Versions 10.4-rc-1, through 16.10.15, 17.0.0-rc-1, through 17.4.7 and 17.5.0-rc-1 through 17.10.0 contain a reflected cross-site scripting vulnerability (XSS) in the comparison view between revisions of a page allows executing JavaScript code in the user's browser. If the current user is an admin, this can not only affect the current user but also the confidentiality, integrity and availability of the whole XWiki instance. If developers are unable to update immediately, they can apply the patch manually to templates/changesdoc.vm in the deployed WAR.

EPSS: 0.005 (42.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Xwiki
Xwiki Xwiki-platform — versions >= 10.4-rc-1, < 16.10.16, >= 17.0.0-rc-1, < 17.4.8, >= 17.5.0-rc-1, < 17.10.1

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40105?: CVE-2026-40105 is a medium-severity vulnerability in Xwiki, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 6.1/10. Published 2026-04-15.
How severe is CVE-2026-40105?: Medium severity. CVSS v3 base score is 6.1 out of 10.