How severe is CVE-2023-26478?

CVE-2023-26478 has a CVSS score of 6.6/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2023-26478?

CVE-2023-26478 affects the following packages: org.xwiki.platform:xwiki-platform-store-filesystem-oldcore (Maven), org.xwiki.platform:xwiki-platform-store-filesystem-oldcore (Maven). Ecosystems affected: Maven.

How do I fix CVE-2023-26478?

Update org.xwiki.platform:xwiki-platform-store-filesystem-oldcore to 14.4.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-26478 is resolved across your whole dependency graph.

How do I detect CVE-2023-26478 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.xwiki.platform:xwiki-platform-store-filesystem-oldcore, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2023-26478 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2023-26478 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2023-26478, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-26478?

CVE-2023-26478 has an EPSS (Exploit Prediction Scoring System) score of 0.7%, placing it in the 52th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2023-26478?

CVE-2023-26478 is classified as CWE-749 (CWE-749). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2023-26478 published, and has it been updated?

CVE-2023-26478 was published on March 2, 2023 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2023-26478 — xwiki-platform-store-file…

MEDIUMFix: xwiki/xwiki-platform@3c73c59

CVE-2023-26478 is a medium-severity (CVSS 6.6) CWE-749 vulnerability in org.xwiki.platform:xwiki-platform-store-filesystem-oldcore. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for org.xwiki.platform:xwiki-platform-store-filesystem-oldcore — see the affected versions and patch details below.

org.xwiki.platform:xwiki-platform-store-filesystem-oldcore has Exposed Dangerous Method or Function

Also known asGHSA-8692-g6g9-gm5p

Published

Mar 2, 2023

Updated

Oct 28, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

1 known

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-26478.

EPSS Exploitation Probability

via FIRST.org ↗

0.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs52th percentile — riskier than 52% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

☕org.xwiki.platform:xwiki-platform-store-filesystem-oldcore☕org.xwiki.platform:xwiki-platform-store-filesystem-oldcore

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Impact

org.xwiki.store.script.TemporaryAttachmentsScriptService#uploadTemporaryAttachment is returning 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.

Patches

This has been patched in the version 14.9-rc-1 and 14.4.6.

Workarounds

There's no workaround for this issue.

References

https://jira.xwiki.org/browse/XWIKI-20180

For more information

If you have any questions or comments about this advisory:

Open an issue in JIRA
Email us at security ML

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.xwiki.platform:xwiki-platform-store-filesystem-oldcore`	≥ 14.3-rc-1&&< 14.4.6	14.4.6`org.xwiki.platform:xwiki-platform-store-filesystem-oldcore:14.4.6`
☕Maven	`org.xwiki.platform:xwiki-platform-store-filesystem-oldcore`	≥ 14.5&&< 14.9-rc-1	14.9-rc-1`org.xwiki.platform:xwiki-platform-store-filesystem-oldcore:14.9-rc-1`

Affected Products

1 product · 2 configurations

Application

xwikixwiki

≥ 14.5 && < 14.9

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

XWiki Platform is a generic wiki platform. Starting in version 14.3-rc-1…

jira.xwiki.orgNVDMar 2023

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.xwiki.platform:xwiki-platform-store-filesystem-oldcore, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.xwiki.platform:xwiki-platform-store-filesystem-oldcore to 14.4.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-26478 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact `org.xwiki.store.script.TemporaryAttachmentsScriptService#uploadTemporaryAttachment` is returning 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. ### Patches This has been patched in the version 14.9-rc-1 and 14.4.6. ### Workarounds There's no workaround for this issue. ### References https://jira.xwiki.org/browse/XWIKI-20180 ### For more information If you