CVE-2026-48707

3.1 lowEPSS 0.3%

Low (3.1). EPSS 0.3% chance of exploitation in the next 30 days.

InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Server-Side Request Forgery (SSRF) vulnerability in the file upload functionality (`system/core/uploader.php` at lines 509-532). When the "upload from URL" feature follows an HTTP redirect, the redirected target URL bypasses the private IP address blacklist check. This allows authenticated users to scan and access internal network services. Version 2.18.2 contains a fix.

Severity

CVSS 3.1

3.1 low

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-31)
CWE: CWE-918
Published: 2026-09-08
Modified: 2026-09-11
Record from: the NVD, synced 2026-10-19

References

https://github.com/instantsoft/icms2/commit/04b8fe0eb75fc5f44eecb15684c7d3660586683d
https://github.com/instantsoft/icms2/security/advisories/GHSA-cm47-mwv3-f534
https://github.com/instantsoft/icms2/security/advisories/GHSA-cm47-mwv3-f534

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