🛡️ CVE-2026-39850 — yii2

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-20 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Yii 2: Local file inclusion via view parameter name collision

The core view rendering method View::renderPhpFile() calls extract($_params_, EXTR_OVERWRITE) 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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2026-39850 is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.

Affected software

CVE-2026-39850 is recorded against 2 packages.

  • unknown
  • yiisoft/yii2 (fixed in 2.0.55)

Timeline and source

Published on 20 May 2026 and last revised on 23 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE CWE-20
Public Exploit ✅ No
Source NVD
Published 2026-05-20
Updated 2026-08-12
Modified 2026-07-23
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —
yiisoft/yii2 — 2.0.55

Similar Threats

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