CVE-2018-20745
Yii Incorrectly Implements CORS
Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
CVE-2018-20745- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
CVE List No score
Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
CVE-2018-20745- Updated
- 2026-11-02
EUVDEUVD-2022-3621 No score
Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
EUVD-2022-3621- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cr6r-6xm9-ww22
Yii Incorrectly Implements CORS
Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
GHSA-cr6r-6xm9-ww22- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
OSV
Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
CVE-2018-20745- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-cr6r-6xm9-ww22
Yii Incorrectly Implements CORS
Yii 2.x through 2.0.15.1 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.
- Record
GHSA-cr6r-6xm9-ww22- CVSS 3.0
- 5.9 Medium
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-346
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
yiisoft/yii2Packagist |
before 2.0.16 | 2.0.16 |
yiisoft/yii2Packagist |
before 2.0.16, plus listed versions 2.0.02.0.0-alpha2.0.0-beta2.0.0-rc2.0.1 Show 24 moreShow less2.0.102.0.112.0.11.12.0.11.22.0.122.0.12.12.0.12.22.0.132.0.13.12.0.13.22.0.13.32.0.142.0.14.12.0.14.22.0.152.0.15.12.0.22.0.32.0.42.0.52.0.62.0.72.0.82.0.9 |
2.0.16 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-20745 is a medium vulnerability (CVSS 5.9) in Yiiframework Yii, published January 28, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. Fixed in yiisoft/yii2 2.0.16.