How severe is CVE-2023-29202?

CVE-2023-29202 has a CVSS score of 9/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-29202?

CVE-2023-29202 affects the following packages: org.xwiki.platform:xwiki-core-rendering-macro-rss (Maven), org.xwiki.platform:xwiki-platform-rendering-macro-rss (Maven). Ecosystems affected: Maven.

How do I fix CVE-2023-29202?

A fix is available for CVE-2023-29202; check the affected-versions list above or the advisory for the patched release of org.xwiki.platform:xwiki-core-rendering-macro-rss, then make sure no transitive dependency still pins the vulnerable range.

How do I detect CVE-2023-29202 in my Maven dependencies?

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

How do I mitigate CVE-2023-29202 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2023-29202 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2023-29202, 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-2023-29202?

CVE-2023-29202 has an EPSS (Exploit Prediction Scoring System) score of 1.4%, placing it in the 72th 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-2023-29202?

CVE-2023-29202 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2023-29202 published, and has it been updated?

CVE-2023-29202 was published on April 15, 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-2023-29202 — xwiki-core-rendering-macr…

CRITICALFix: xwiki/xwiki-platform@5c7ebe4

CVE-2023-29202 is a critical-severity (CVSS 9) Cross-site Scripting (XSS) vulnerability in org.xwiki.platform:xwiki-core-rendering-macro-rss. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for org.xwiki.platform:xwiki-core-rendering-macro-rss — see the affected versions and patch details below.

org.xwiki.platform:xwiki-platform-rendering-macro-rss Cross-site Scripting vulnerability

Also known asGHSA-c885-89fw-55qr

Published

Apr 15, 2023

Updated

Oct 28, 2026

Affected

2 pkgs

Patched

1 / 2

Exploits

2 known

Exploitation data as of Nov 6, 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-2023-29202.

EPSS Exploitation Probability

via FIRST.org ↗

1.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs72th percentile — riskier than 72% 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-core-rendering-macro-rss☕org.xwiki.platform:xwiki-platform-rendering-macro-rss

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

The RSS macro that is bundled in XWiki included the content of the feed items without any cleaning in the HTML output when the parameter content was set to true. This allowed arbitrary HTML and in particular also JavaScript injection and thus cross-site scripting (XSS) by specifying an RSS feed with malicious content. With the interaction of a user with programming rights, this could be used to execute arbitrary actions in the wiki, including privilege escalation, remote code execution, information disclosure, modifying or deleting content and sabotaging the wiki.

The issue can be reproduced by inserting the following XWiki syntax in any wiki page like the user account:

{{rss feed="https://xssrss.blogspot.com/feeds/posts/default?alt=rss" content="true" /}}

If an alert is displayed when viewing the page, the wiki is vulnerable.

Patches

The issue has been patched in XWiki 14.6 RC1, the content of the feed is now properly cleaned before being displayed.

Workarounds

If the RSS macro isn't used in the wiki, the macro can be uninstalled by deleting WEB-INF/lib/xwiki-platform-rendering-macro-rss-XX.jar, where XX is XWiki's version, in the web application's directory.

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

2 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.xwiki.platform:xwiki-core-rendering-macro-rss`	≥ 1.8	No fix
☕Maven	`org.xwiki.platform:xwiki-platform-rendering-macro-rss`	all versions	14.6-rc-1`org.xwiki.platform:xwiki-platform-rendering-macro-rss:14.6-rc-1`

Affected Products

1 product · 4 configurations

Application

xwikixwiki

> 1.8 && ≤ 14.5

1 version

1.8

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 Commons are technical libraries common to several other top level …

jira.xwiki.orgNVDApr 2023

Report on github.com

github.comNVDApr 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-core-rendering-macro-rss, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
A fix is available for CVE-2023-29202; check the affected-versions list above or the advisory for the patched release of org.xwiki.platform:xwiki-core-rendering-macro-rss, then make sure no transitive dependency still pins the vulnerable range.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact The [RSS macro](https://extensions.xwiki.org/xwiki/bin/view/Extension/RSS%20Macro) that is bundled in XWiki included the content of the feed items without any cleaning in the HTML output when the parameter `content` was set to `true`. This allowed arbitrary HTML and in particular also JavaScript injection and thus cross-site scripting (XSS) by specifying an RSS feed with malicious content. With the interaction of a user with programming rights, this could be used to execute arbitrary actions in the wiki, including privilege escalation, remote code execution, information disclosure,