EUVD-2026-73924Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Network vector confirmed; AC:H reflects required attacker-controlled redirect server; PR:L for authenticated-only access; C:L for internal service probing only.
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Server-Side Request Forgery in InstantCMS versions prior to 2.18.2 allows authenticated users to probe internal network services by exploiting a redirect-bypass flaw in the 'upload from URL' feature. The uploader validates the initial URL against a private IP blacklist, but when the remote server issues an HTTP redirect, the redirected target URL is followed without re-validation, allowing the blacklist to be bypassed entirely. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated session on the InstantCMS installation - any account with access to the 'upload from URL' file upload feature suffices (PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 3.1 (Low) with vector AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N is a reasonable and accurate representation of real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to InstantCMS 2.18.2, which contains the complete fix as documented in commit 04b8fe0eb75fc5f44eecb15684c7d3660586683d and the security advisory GHSA-cm47-mwv3-f534. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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