How severe is CVE-2023-29516?

CVE-2023-29516 has a CVSS score of 9.9/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-29516?

CVE-2023-29516 affects the following packages: org.xwiki.platform:xwiki-platform-attachment-ui (Maven), org.xwiki.platform:xwiki-platform-attachment-ui (Maven), org.xwiki.platform:xwiki-platform-attachment-ui (Maven). Ecosystems affected: Maven.

How do I fix CVE-2023-29516?

Update org.xwiki.platform:xwiki-platform-attachment-ui to 13.10.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-29516 is resolved across your whole dependency graph.

How do I detect CVE-2023-29516 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-attachment-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2023-29516 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-2023-29516 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2023-29516, including 2 in-the-wild exploitations 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-2023-29516?

CVE-2023-29516 has an EPSS (Exploit Prediction Scoring System) score of 65.9%, placing it in the 99th 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. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

What type of vulnerability is CVE-2023-29516?

CVE-2023-29516 is classified as CWE-74 (CWE-74). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2023-29516 published, and has it been updated?

CVE-2023-29516 was published on April 18, 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

CRITICAL severity

CVE-2023-29516 — xwiki-platform-attachment…

CRITICALFix: xwiki/xwiki-platform@aca1d67

CVE-2023-29516 is a critical-severity (CVSS 9.9) CWE-74 vulnerability in org.xwiki.platform:xwiki-platform-attachment-ui. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for org.xwiki.platform:xwiki-platform-attachment-ui — see the affected versions and patch details below.

Code injection from view right on XWiki.AttachmentSelector in xwiki-platform

Also known asGHSA-3989-4c6x-725f

Published

Apr 18, 2023

Updated

Oct 28, 2026

Affected

3 pkgs

Patched

3 / 3

Exploits

2 known

Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-29516.

EPSS Exploitation Probability

via FIRST.org ↗

65.9%probability of exploitation in next 30 days

High Risk0.00%

Lower risk than most CVEs99th percentile — riskier than 99% 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

3 pkgs affected

☕org.xwiki.platform:xwiki-platform-attachment-ui☕org.xwiki.platform:xwiki-platform-attachment-ui☕org.xwiki.platform:xwiki-platform-attachment-ui

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

Any user with view rights on XWiki.AttachmentSelector can execute arbitrary Groovy, Python or Velocity code in XWiki leading to full access to the XWiki installation. The root cause is improper escaping in the "Cancel and return to page" button. This page is installed by default.

See https://jira.xwiki.org/browse/XWIKI-20275 for the reproduction steps.

Patches

The vulnerability has been patched in XWiki 15.0-rc-1, 14.10.1, 14.4.8, and 13.10.11.

Workarounds

The issue can be fixed by applying this patch on XWiki.AttachmentSelector.

References

For more information

If you have any questions or comments about this advisory:

Open an issue in Jira XWiki.org
Email us at Security Mailing List

Affected Packages

3 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.xwiki.platform:xwiki-platform-attachment-ui`	≥ 2.0-rc-2&&< 13.10.11	13.10.11`org.xwiki.platform:xwiki-platform-attachment-ui:13.10.11`
☕Maven	`org.xwiki.platform:xwiki-platform-attachment-ui`	≥ 14.0-rc-1&&< 14.4.8	14.4.8`org.xwiki.platform:xwiki-platform-attachment-ui:14.4.8`
☕Maven	`org.xwiki.platform:xwiki-platform-attachment-ui`	≥ 14.5&&< 14.10.1	14.10.1`org.xwiki.platform:xwiki-platform-attachment-ui:14.10.1`

Affected Products

1 product · 3 configurations

Application

xwikixwiki

≥ 14.5 && < 14.10.1

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 offering runtime services for …

github.comNVDApr 2023

Report on jira.xwiki.org

jira.xwiki.orgNVDApr 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-attachment-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.xwiki.platform:xwiki-platform-attachment-ui to 13.10.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-29516 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 Any user with view rights on `XWiki.AttachmentSelector` can execute arbitrary Groovy, Python or Velocity code in XWiki leading to full access to the XWiki installation. The root cause is improper escaping in the "Cancel and return to page" button. This page is installed by default. See https://jira.xwiki.org/browse/XWIKI-20275 for the reproduction steps. ### Patches The vulnerability has been patched in XWiki 15.0-rc-1, 14.10.1, 14.4.8, and 13.10.11. ### Workarounds The issue can be fixed by applying this [patch](https://github.com/xwiki/xwiki-platform/commit/aca1d677c58563bbe6e3