Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
XWiki (xwiki-platform-distribution-war) versions 14.10 before 14.10.18, 15.0-rc-1 before 15.5.3, and 15.6-rc-1 before 15.8-rc-1 are vulnerable. A user who can attach a file to a page can upload a malformed TAR file that, when parsed by Tika, causes CPU consumption and denial of service. Upgrade to 14.10.18, 15.5.3, 15.8-rc-1 or later. The source also describes a workaround of replacing the commons-compress library in WEB-INF/lib with version 1.24.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0064, the 51st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:18 UTC First seen by agentprime
- 31 Oct 2026, 14:18 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-8959-rfxh-r4j4
- OSV: GHSA-8959-rfxh-r4j4
- github.com/xwiki/xwiki-platform/security/advisories/GHSA-8959-rfxh-r4j4
- nvd.nist.gov/vuln/detail/CVE-2024-21651
- github.com/xwiki/xwiki-platform
- jira.xwiki.org/browse/XCOMMONS-2796
- search.maven.org/remotecontent?filepath=org/apache/commons/commons-compress/1.24.0/commons-compress-1.24.0.jar