CVE-2023-26478

Name: CVE-2023-26478
Creator: NVD / NIST
Published: 2023-03-02T18:15:10.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.67%

Last modified Jun 17, 2026

CVE-2023-26478 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. XWiki Platform is a generic wiki platform. Starting in version 14.3-rc-1, `org.xwiki.store.script.TemporaryAttachmentsScriptService#uploadTemporaryAttachment` returns an instance of `com.xpn.xwiki.doc.XWikiAttachment`. EPSS estimates a 0.67% chance of exploitation in the next 30 days.

Description

XWiki Platform is a generic wiki platform. Starting in version 14.3-rc-1, `org.xwiki.store.script.TemporaryAttachmentsScriptService#uploadTemporaryAttachment` returns an instance of `com.xpn.xwiki.doc.XWikiAttachment`. This class is not supported to be exposed to users without the `programing` right. `com.xpn.xwiki.api.Attachment` should be used instead and takes case of checking the user's rights before performing dangerous operations. This has been patched in versions 14.9-rc-1 and 14.4.6. There are no known workarounds for this issue.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.67%

47.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-749

Affected Software

Vendor	Product	Versions
Xwiki	Xwiki	>= 14.3, < 14.4.6
Xwiki	Xwiki	>= 14.5, < 14.9

References

https://github.com/xwiki/xwiki-platform/commit/3c73c59e39b6436b1074d8834cf276916010014dPatch
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-8692-g6g9-gm5pVendor Advisory
https://jira.xwiki.org/browse/XWIKI-20180Exploit, Issue Tracking, Vendor Advisory
https://github.com/xwiki/xwiki-platform/commit/3c73c59e39b6436b1074d8834cf276916010014dPatch
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-8692-g6g9-gm5pVendor Advisory
https://jira.xwiki.org/browse/XWIKI-20180Exploit, Issue Tracking, Vendor Advisory

Timeline

Published: Mar 2, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-26478?

How severe is CVE-2023-26478?

CVE-2023-26478 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.67% probability of exploitation in the next 30 days.

How do I fix CVE-2023-26478?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-26478?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST