How severe is CVE-2024-55877?

CVE-2024-55877 has a CVSS score of 9.9/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2024-55877?

CVE-2024-55877 affects the following packages: org.xwiki.platform:xwiki-platform-help-ui (Maven), org.xwiki.platform:xwiki-platform-help-ui (Maven), org.xwiki.platform:xwiki-platform-help-ui (Maven). Ecosystems affected: Maven.

How do I fix CVE-2024-55877?

Update org.xwiki.platform:xwiki-platform-help-ui to 15.10.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-55877 is resolved across your whole dependency graph.

How do I detect CVE-2024-55877 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-help-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2024-55877 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Is CVE-2024-55877 actively exploited in the wild?

No public exploit code has been indexed for CVE-2024-55877 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2024-55877?

CVE-2024-55877 has an EPSS (Exploit Prediction Scoring System) score of 1.6%, placing it in the 76th 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-2024-55877?

CVE-2024-55877 is classified as CWE-96 (CWE-96), Code Injection (CWE-94). These weakness types 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-2024-55877 published, and has it been updated?

CVE-2024-55877 was published on December 12, 2024 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-2024-55877 — xwiki-platform-help-ui

CRITICALFix: xwiki/xwiki-platform@40e1afe

CVE-2024-55877 is a critical-severity (CVSS 9.9) CWE-96 vulnerability in org.xwiki.platform:xwiki-platform-help-ui. A fix is available for org.xwiki.platform:xwiki-platform-help-ui — see the affected versions and patch details below.

XWiki allows remote code execution from account through macro descriptions and XWiki.XWikiSyntaxMacrosList

Also known asGHSA-2r87-74cx-2p7c

Published

Dec 12, 2024

Updated

Oct 28, 2026

Affected

3 pkgs

Patched

3 / 3

Exploits

None indexed

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-2024-55877.

EPSS Exploitation Probability

via FIRST.org ↗

1.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs76th percentile — riskier than 76% 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-help-ui☕org.xwiki.platform:xwiki-platform-help-ui☕org.xwiki.platform:xwiki-platform-help-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 an account can perform arbitrary remote code execution by adding instances of XWiki.WikiMacroClass to any page. This compromises the confidentiality, integrity and availability of the whole XWiki installation.

To reproduce on a instance, as a connected user without script nor programming rights, go to your user profile and add an object of type XWiki.WikiMacroClass. Set "Macro Id", "Macro Name" and "Macro Code" to any value, "Macro Visibility" to Current User and "Macro Description" to {{async}}{{groovy}}println("Hello from User macro!"){{/groovy}}{{/async}}. Save the page, then go to <host>/xwiki/bin/view/XWiki/XWikiSyntaxMacrosList. If the description of your new macro reads "Hello from User macro!", then your instance is vulnerable.

Patches

This vulnerability has been fixed in XWiki 15.10.11, 16.4.1 and 16.5.0.

Workarounds

It is possible to manually apply this patch to the page XWiki.XWikiSyntaxMacrosList.

References

Affected Packages

3 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.xwiki.platform:xwiki-platform-help-ui`	≥ 9.7-rc-1&&< 15.10.11	15.10.11`org.xwiki.platform:xwiki-platform-help-ui:15.10.11`
☕Maven	`org.xwiki.platform:xwiki-platform-help-ui`	≥ 16.0.0-rc-1&&< 16.4.1	16.4.1`org.xwiki.platform:xwiki-platform-help-ui:16.4.1`
☕Maven	`org.xwiki.platform:xwiki-platform-help-ui`	≥ 16.5.0-rc-1&&< 16.5.0	16.5.0`org.xwiki.platform:xwiki-platform-help-ui:16.5.0`

Affected Products

1 product · 3 configurations

Application

xwikixwiki

≥ 16.0.0 && < 16.4.1

1 version

16.5.0

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-help-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.xwiki.platform:xwiki-platform-help-ui to 15.10.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-55877 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

### Impact Any user with an account can perform arbitrary remote code execution by adding instances of `XWiki.WikiMacroClass` to any page. This compromises the confidentiality, integrity and availability of the whole XWiki installation. To reproduce on a instance, as a connected user without script nor programming rights, go to your user profile and add an object of type `XWiki.WikiMacroClass`. Set "Macro Id", "Macro Name" and "Macro Code" to any value, "Macro Visibility" to `Current User` and "Macro Description" to `{{async}}{{groovy}}println("Hello from User macro!"){{/groovy}}{{/async}}`.