CVE-2024-4990: In yiisoft/yii2 version 2.0.48, the base Component class contains a vulnerability where the `__set()` magic me

This week

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2024-4990 is a critical-severity flaw (CVSS 9.1) affecting yii. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In yiisoft/yii2 version 2.0.48, the base Component class contains a vulnerability where the `__set()` magic method does not validate that the value passed is a valid Behavior class name or configuration. This allows an attacker to instantiate arbitrary classes, passing parameters to their constructors and invoking setter methods. Depending on the installed dependencies, various types of attacks are possible, including the execution of arbitrary c

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	80.1% (top 1%)
CISA exploited list	No
Weakness	CWE-470
Published	2025-03-20
Last modified	2026-06-17

Publisher (CNA): huntr.dev · Vendor: yiiframework

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-20 10:15 UTCPublished CVE record published
2026-06-17 08:03 UTCUpdated Record last modified

yiiframework yii DOWNGRADE

Affected: 2.0.48

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.48

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.48 (Debian / Ubuntu)

apt-cache madison yii sudo apt install yii=<VERSION_BEFORE_2.0.48> sudo apt-mark hold yii

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

dnf --showduplicates list yii sudo dnf downgrade yii-<VERSION_BEFORE_2.0.48> sudo dnf versionlock add yii

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

A distro patch exists: prefer upgrading over downgrading.

Composer (PHP) · yiisoft/yii2 · FIXED · 2.0.49.4 · vulnerable: < 2.0.49.4 · source

composer require "yiisoft/yii2:>=2.0.49.4"

Fedora ELN · ibus-typing-booster · FIXED · 2.31.3-1.eln159 · FEDORA-2026-c895c68d60 · source

sudo dnf upgrade --advisory=FEDORA-2026-c895c68d60

Fedora 46 · perl-WWW-OrangeHRM-Client · FIXED · 0.12.0-21.fc46 · FEDORA-2026-2d14efca09 · source

sudo dnf upgrade --advisory=FEDORA-2026-2d14efca09

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-2024-4990?

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

Is CVE-2024-4990 being exploited?

CVE-2024-4990 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-2024-4990 affect?

CVE-2024-4990 affects yii. Severity is critical (CVSS 9.1). In yiisoft/yii2 version 2.0.48, the base Component class contains a vulnerability where the `__set()` magic method does not validate that the value passed is a valid Behavior class name or configuration. This allows an attacker to instantia

How urgent is CVE-2024-4990?

Priority 67/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-32027 MEDIUM 6.1 UPGRADE Yii is an open source PHP web framework
CVE-2025-2690 MEDIUM 6.3 UPGRADE A vulnerability, which was classified as critical, was found in yiisoft Yii2 up to 2.0.39
CVE-2025-2689 MEDIUM 6.3 UPGRADE A vulnerability, which was classified as critical, has been found in yiisoft Yii2 up to 2.0.45
CVE-2024-58136 CRITICAL 9.0 EXPLOITED UPGRADE Yiiframework Yii Improper Protection of Alternate Path Vulnerability
CVE-2024-32877 MEDIUM 4.2 DOWNGRADE Yii 2 is a PHP application framework

References

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