CVE-2026-104711: Improper neutralization of special elements used in an expression language statement ('Expression Language Inj

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CRITICAL 9.8REMOTEWATCHLISTUPGRADE

CVE-2026-104711 is a critical-severity flaw (CVSS 9.8) affecting struts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper neutralization of special elements used in an expression language statement ('Expression Language Injection') vulnerability in Apache Struts. If the application is configured to use the legacy RESTful action mapper, a crafted request can inject an OGNL expression that may lead to remote code execution. Struts 7 is affected only when the OGNL allowlist is disabled; it is enabled by default. Applications using the default action mapper, th

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Weakness	CWE-917
Published	2026-10-05
Last modified	2026-10-08

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-05 19:17 UTCPublished CVE record published
2026-10-08 19:05 UTCUpdated Record last modified

apache struts UPGRADE

Affected: >= 2.0.0 and <= 2.3.37 · >= 2.5.0 and <= 2.5.33 · >= 6.0.0 and < 6.12.0 · >= 7.0.0 and < 7.4.0

Fixed in: 6.12.0, 7.4.0

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to 6.12.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade struts

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade struts

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison struts sudo apt install struts=<VERSION_BEFORE_2.0.0> sudo apt-mark hold struts

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list struts sudo dnf downgrade struts-<VERSION_BEFORE_2.0.0> 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.

Exact fixes by distribution

Fedora ELN · edk2 · FIXED · 20260812-12.eln159 · FEDORA-2026-e316b6370a · source

sudo dnf upgrade --advisory=FEDORA-2026-e316b6370a

Fedora 46 · perl-Mojo-DOM58 · FIXED · 3.003-1.fc46 · FEDORA-2026-d5412af3de · source

sudo dnf upgrade --advisory=FEDORA-2026-d5412af3de

RHEL 10 · google-guice · NOT AFFECTED

RHEL 8 · javapackages-tools:201801/google-guice · NOT AFFECTED

RHEL 9 · google-guice · NOT AFFECTED

RHEL 9 · maven:3.9/google-guice · NOT AFFECTED

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: uday952/CVE-2026-104711 (0 stars)
GitHub PoC: uday952/CVE-2026-104711-POC-NEW-VARIANT (0 stars)

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-2026-104711?

struts: upgrade to 6.12.0, 7.4.0. Exact commands for each OS are on this page.

Is CVE-2026-104711 being exploited?

CVE-2026-104711 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-2026-104711 affect?

CVE-2026-104711 affects struts. Severity is critical (CVSS 9.8). Improper neutralization of special elements used in an expression language statement ('Expression Language Injection') vulnerability in Apache Struts. If the application is configured to use the legacy RESTful action mapper, a crafted reque

How urgent is CVE-2026-104711?

Priority 65/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache Struts vulnerabilities

Related CVEs

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
CVE-2026-104712 HIGH 7.5 UPGRADE Asymmetric resource consumption (amplification) vulnerability in Apache Struts

References

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