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High, CVSS 7.4

Yii 2: Local file inclusion via view parameter name collision

CVE-2026-39850GHSA-5vpg-rj7q-qpw2

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (yiisoft/yii2 2.0.55), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
  • CVE-2026-39850: 0.46% estimated exploitation activity in the next 30 days; percentile 39.54 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The core view rendering method View::renderPhpFile() calls extract($params, EXTROVERWRITE) before the require statement that includes the view file. A caller-controlled parameter named file in the $params array overwrites the internal local variable that specifies which file is included — enabling a Local File Inclusion primitive. Impact - Local File Inclusion (arbitrary file read via non-PHP files) - Potential RCE if attacker can write PHP files via a separate primitive - Information disclosure Patches 2.0.55 Workarounds No.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-5vpg-rj7q-qpw2

Agent brief

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# Patch Next advisory brief: CVE-2026-39850

Advisory: Yii 2: Local file inclusion via view parameter name collision
IDs: CVE-2026-39850, GHSA-5vpg-rj7q-qpw2
Record: https://patchnext.com/advisories/cve-2026-39850 (revision 1, source checked 26 Oct 2026, 14:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: yiisoft/yii2 2.0.55. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist yiisoft/yii2: affected < 2.0.55; fixed in 2.0.55

## Suggested inspection (read-only)
- Packagist yiisoft/yii2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on yiisoft/yii2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5vpg-rj7q-qpw2 (GitHub-reviewed advisory GHSA-5vpg-rj7q-qpw2 lists affected ranges: Packagist yiisoft/yii2 >=0 <2.0.55)

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