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☕ Maven
Not in CISA KEV
HIGH severity

CVE-2015-5209 — struts2-core

HIGH

CVE-2015-5209 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in org.apache.struts:struts2-core. A fix is available for org.apache.struts:struts2-core — see the affected versions and patch details below.

Special top object can be used to access Struts' internals

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
9.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs95th percentile — riskier than 95% of all scored CVEsHighest risk
0.00%3.79%7.58%11.4%1.4%9.1%May 26Aug 26Oct 26

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

1 pkg affected
☕org.apache.struts:struts2-core

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

ValueStack defines special top object which represents root of execution context. It can be used to manipulate Struts' internals or can be used to affect container's settings. Applying better regex which includes pattern to exclude request parameters trying to use top object. This issue was patched in Struts 2.3.24.1.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.struts:struts2-coreall versions2.3.24.1org.apache.struts:struts2-core:2.3.24.1

Affected Products

1 product · 66 configurations
Application
strutsapache
66 versions
2.0.02.0.12.0.22.0.32.0.42.0.52.0.62.0.72.0.82.0.92.0.102.0.11

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.struts:struts2-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.struts:struts2-core to 2.3.24.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-5209 is resolved across your whole dependency graph.

  3. 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

ValueStack defines special top object which represents root of execution context. It can be used to manipulate Struts' internals or can be used to affect container's settings. Applying better regex which includes pattern to exclude request parameters trying to use top object. This issue was patched in Struts 2.3.24.1.
O3 Security · Impact-Aware SCA

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CVE-2015-5209: struts2-core — Fixed in 2.3.24.1