CVE-2026-40105: XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it

Routine

MEDIUM 6.1UPGRADE

CVE-2026-40105 is a medium-severity flaw (CVSS 6.1) affecting xwiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-80
Published	2026-04-15
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: xwiki

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-15 04:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

xwiki xwiki UPGRADE

Affected: >= 10.4 and < 16.10.16 · >= 17.0.0 and < 17.4.8 · >= 17.5.0 and < 17.10.1

Fixed in: 16.10.16, 17.4.8, 17.10.1

Safe to downgrade to: a release before 10.4

1. Check installed version

apt-cache policy xwiki || rpm -q xwiki || xwiki --version

2. UPGRADE to 16.10.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade xwiki

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xwiki

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.4 (Debian / Ubuntu)

apt-cache madison xwiki sudo apt install xwiki=<VERSION_BEFORE_10.4> sudo apt-mark hold xwiki

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xwiki sudo dnf downgrade xwiki-<VERSION_BEFORE_10.4> sudo dnf versionlock add xwiki

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: XWiki - Cross-Site Scripting

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40105?

xwiki: upgrade to 16.10.16, 17.4.8, 17.10.1. Exact commands for each OS are on this page.

Is CVE-2026-40105 being exploited?

CVE-2026-40105 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40105 affect?

CVE-2026-40105 affects xwiki. Severity is medium (CVSS 6.1). 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 scrip

How urgent is CVE-2026-40105?

Priority 33/100. No elevated risk signals yet.

Related CVEs

CVE-2026-40104 HIGH 8.2 UPGRADE XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it
CVE-2023-29525 CRITICAL 9.9 UPGRADE XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it

References

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