CVE-2026-103475
CRITICALDescription
yii2-starter-kit through 4.2.0 exposes the Yii debug and Gii modules to all IP addresses by setting allowedIPs to ['*'] in its default development configuration. Unauthenticated remote attackers can access the debug endpoint to read sensitive data including session cookies and database queries, or access the Gii endpoint to generate and write PHP files into the application directory.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 32% of all known CVEs.
References
Related Vulnerabilities
Other CWE-489 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-32645 | Critical | 9.8 | 54% | - | - |
| CVE-2017-5259 | High | 8.8 | 32% | - | - |
| CVE-2022-20649 | High | 8.1 | 12% | - | - |
| CVE-2022-38715 | High | 8.8 | 3.7% | - | - |
| CVE-2018-5454 | High | 8.1 | 3.4% | - | - |
| CVE-2024-9643 | Critical | 9.8 | 3.0% | - | - |
Common questions
How do I fix CVE-2026-103475?
No published fix for CVE-2026-103475 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-103475 being actively exploited?
Not that we know of. CVE-2026-103475 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.40% is the estimated probability that it will be exploited in the next 30 days. That is higher than 32% of all scored CVEs.
How severe is CVE-2026-103475?
CVE-2026-103475 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-30.