EUVD-2026-53097
GHSA-f8rj-8x92-pfp5
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable API endpoint (AV:N), trivial injection with no race condition (AC:L), requires media-scoped account (PR:L), full triad impact via shell execution (C/I/A:H).
Primary rating from Vendor (TuranSec).
CVSS VectorVendor: TuranSec
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionCVE.org
HashBrown CMS through 1.4.6 contains an OS Command Injection vulnerability (CWE-78) in the media upload thumbnail generation routine. Media.generateThumbnail() in src/Server/Entity/Resource/Media.js builds a temporary file path as 'thumbnail' + Path.extname(filename) and passes it, unescaped, into a shell command executed via AppService.exec() ('convert ' + tempFile + ...). The MIME-type filter in getMIMEType() (src/Common/utilities.js) truncates the extracted extension at the first '?' character, while Path.extname() does not, allowing a filename such as 'x.jpg?$(command)' to pass the image-type check while still injecting a shell command substitution into the exec() call. An authenticated user holding the media resource scope can achieve arbitrary OS command execution in the context of the Node.js process via POST /api/{project}/{environment}/media/new.
Articles & Coverage 1
AnalysisAI
OS command injection in HashBrown CMS through version 1.4.6 enables any authenticated user holding media resource scope to execute arbitrary shell commands on the server by exploiting a discrepancy between two filename-parsing functions. The MIME-type filter in getMIMEType() truncates filenames at the first '?' character - accepting 'x.jpg?$(command)' as a valid image - while Node.js Path.extname() does not truncate at '?', allowing the full malicious suffix to flow unescaped into a shell exec() call inside the thumbnail generation routine. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid authenticated session in HashBrown CMS with the 'media resource scope' permission explicitly granted. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects the risk profile: network-reachable, low complexity, full triad impact, requiring only low-privilege credentials. … 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 | No vendor-released patched version has been identified in the available data - the affected range confirmed by EUVD covers all releases through 1.4.6, and no fix version is referenced in the TuranSec advisory (https://cve.turansec.uz/advisories/TRN-11FC0D88) or the NVD entry. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all HashBrown CMS installations at version 1.4.6 or earlier and immediately restrict network access to media upload endpoints to trusted internal networks only; disable public-facing media resource functionality. …
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Same weakness CWE-78 – OS Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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