CVE-2018-11776

CVE-2018-11776 is a high-severity vulnerability in Apache Struts with a CVSS 3.x base score of 8.1. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2021-11-03).

Key facts

Description

Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set and in same time, its upper package have no or wildcard namespace.

Frequently asked questions

What is CVE-2018-11776?
Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set and in same time, its upper package have no or wildcard namespace.
How severe is CVE-2018-11776?
CVE-2018-11776 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-11776 being actively exploited?
Yes. CVE-2018-11776 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2021-11-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-11776?
CVE-2018-11776 primarily affects Apache Struts. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-11776?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-11776 have an EU (EUVD) identifier?
Yes. CVE-2018-11776 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-0582. It is also flagged as exploited in the EUVD (since 2021-11-03).
When was CVE-2018-11776 published?
CVE-2018-11776 was published on 2018-08-22 and last updated on 2026-06-17.

References

Affected products (10)

More vulnerabilities in Apache Struts

All CVEs affecting Apache Struts →