CVE-2016-1182: ActionServlet.java in Apache Struts 1 1.x through 1.3.10 does not properly restrict the Validator configuratio

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HIGH 8.2REMOTEWATCHLISTDOWNGRADE

CVE-2016-1182 is a high-severity flaw (CVSS 8.2) affecting struts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ActionServlet.java in Apache Struts 1 1.x through 1.3.10 does not properly restrict the Validator configuration, which allows remote attackers to conduct cross-site scripting (XSS) attacks or cause a denial of service via crafted input, a related issue to CVE-2015-0899.

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	25.7% (top 2%)
CISA exploited list	No
Weakness	CWE-20
Published	2016-07-04
Last modified	2026-10-15

Publisher (CNA): JPCERT/CC · Vendor: apache

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-07-04 22:59 UTCPublished CVE record published
2026-10-15 16:17 UTCUpdated Record last modified

apache struts DOWNGRADE

Affected: 1.0 · 1.0 beta1 · 1.0 beta2 · 1.0 beta3 · 1.0.1 · 1.0.2 · 1.1 · 1.1 b1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy struts || rpm -q struts || struts --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison struts sudo apt install struts=<VERSION_BEFORE_1.0> sudo apt-mark hold struts

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list struts sudo dnf downgrade struts-<VERSION_BEFORE_1.0> sudo dnf versionlock add struts

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-1182?

struts: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-1182 being exploited?

CVE-2016-1182 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-1182 affect?

CVE-2016-1182 affects struts. Severity is high (CVSS 8.2). ActionServlet.java in Apache Struts 1 1.x through 1.3.10 does not properly restrict the Validator configuration, which allows remote attackers to conduct cross-site scripting (XSS) attacks or cause a denial of service via crafted input, a r

How urgent is CVE-2016-1182?

Priority 63/100. High severity; EPSS top 2%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache Struts vulnerabilities · Java vulnerabilities

Related CVEs

CVE-2016-1181 HIGH 8.1 DOWNGRADE DOWNGRADE ActionServlet.java in Apache Struts 1 1.x through 1.3.10 mishandles multithreaded access to an ActionForm inst
CVE-2025-66675 HIGH 8.2 UPGRADE Denial of Service vulnerability in Apache Struts, file leak in multipart request processing causes disk exhaus
CVE-2014-0114 HIGH 7.5 UPGRADE DOWNGRADE Apache Commons BeanUtils, as distributed in lib/commons-beanutils-1.8.0.jar in Apache Struts 1.x through 1.3.1
CVE-2026-104714 HIGH 8.8 UPGRADE Concurrent execution using shared resource with improper synchronization ('race condition') vulnerability in A
CVE-2026-104713 MEDIUM 6.5 UPGRADE Allocation of resources without limits or throttling vulnerability in the Apache Struts REST plugin

References

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