CVE-2024-43400: XWiki Platform allows XSS through XClass name in string properties

Should you act?

Critical, preconditions apply

Severe if exploited, but exploitation needs conditions that may not apply to you. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
• EPSS 0.5%, percentile 41: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 41% of all scored CVEs (low). EPSS is a probability, not a verdict.
• Needs an account (low (any account)). Exposure depends on who can log in.
• Only applies if your dependency tree includes org.xwiki.platform:xwiki-platform-oldcore (Maven) >= 1.1.2, < 14.10.21, fixed in 14.10.21; org.xwiki.platform:xwiki-platform-oldcore (Maven) >= 15.0-rc-1, < 15.5.5, fixed in 15.5.5; org.xwiki.platform:xwiki-platform-oldcore (Maven) >= 15.6-rc-1, < 15.10.6, fixed in 15.10.6; org.xwiki.platform:xwiki-platform-oldcore (Maven) = 16.0.0-rc-1, fixed in 16.0.0. Check your lockfile, including transitive dependencies.

What it is

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. It is possible for a user without Script or Programming rights to craft a URL pointing to a page with arbitrary JavaScript. This requires social engineer to trick a user to follow the URL. This has been patched in XWiki 14.10.21, 15.5.5, 15.10.6 and 16.0.0.

From the GitHub advisory

Impact Is it possible for a user without Script or Programming rights to craft a URL pointing to a page with arbitrary JavaScript. This requires social engineer to trick a user to follow the URL.

Reproduction steps

1. As a user without script or programming right, create a (non-terminal) document named " + alert(1) + " (the quotes need to be part of the name). 1. Edit the class. 1. Add a string property named "test". 1. Edit using the object editor and add an object of the created class 1. Get an admin to open /xwiki/bin/view/%22%20%2B%20alert(1)%20%2B%20%22/?viewer=display&type=object&property=%22%20%2B%20alert(1)%20%2B%20%22.WebHome.test&mode=edit where is the URL of your XWiki installation.

Patches This has been patched in XWiki 14.10.21, 15.5.5, 15.10.6 and 16.0.0.

Workarounds

Weakness type: CWE-96, CWE-79.

Product: org.xwiki.platform:xwiki-platform-oldcore (Maven) · Assigned by: GitHub_M · Published: 2024-08-19

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: low (any account)
• User interaction: passive

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation poc, automatable no, technical impact total.
• FIRST EPSS (model of 2026-10-21): 0.49% probability of exploitation activity in the next 30 days; percentile 41.

Timeline

• 2024-08-19 — CVE record published by GitHub_M
• 2024-08-19 — GitHub-reviewed advisory GHSA-wcg9-pgqv-xm5v published (critical)
• 2024-08-22 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-wcg9-pgqv-xm5v github.com
2. CVE.org record CVE-2024-43400 cve.org
3. NVD entry CVE-2024-43400 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com
2. github.com github.com
3. jira.xwiki.org jira.xwiki.org

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