Critical

Unauthenticated media library file upload and browsing in Kentico 11 through 12

IdentifiersCVE-2019-12102CWE-732· Incorrect Permission Assignment…

CVE-2019-12102 describes a condition in Kentico 11 through 12 where the media library functionality exposed via the cmsmodules/medialibrary/formcontrols/liveselectors/insertimageormedia/tabs_media.aspx endpoint can allow attackers to upload files and browse existing files without authentication. The report states that this access is possible through that URI; however, the vendor disputes the issue as a product vulnerability, asserting that the observed behavior depends on media library permissions being configured to allow such access. According to the vendor, default behavior permits users to read, modify, and upload files, and administrators are expected to restrict access through media library permission settings. Based on the available information, the issue is best characterized as improper or overly permissive authorization affecting media library access control rather than a memory-safety or input-validation flaw.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

If the affected media library is reachable with permissive access settings, an unauthenticated attacker may be able to enumerate and browse stored media and upload arbitrary files into the media library. This can result in unauthorized access to stored content, integrity impact through unauthorized file modification or addition, and potential secondary risks depending on how uploaded files are handled by the application and web server. At minimum, the issue enables unauthorized file management actions; in some deployments, uploaded content could be used for phishing, defacement, or hosting attacker-controlled files. The available information does not establish confirmed remote code execution.

Mitigation

If you can’t patch tonight, do this now.

As an immediate mitigation, disable anonymous access to media library functions and restrict access to cmsmodules/medialibrary/formcontrols/liveselectors/insertimageormedia/tabs_media.aspx at the application or web-server layer. Audit all media libraries for overly broad read/modify/upload permissions, remove upload rights from untrusted roles, and monitor for unexpected file additions. Where feasible, place administrative or content-management paths behind authentication controls, IP allowlisting, or WAF rules. Also review how uploaded files are served to reduce downstream risk from attacker-supplied content.

Remediation

Patch, then assume compromise.

Review and correct Kentico media library permissions so that anonymous or otherwise unauthorized users cannot read, modify, or upload content unless explicitly intended. Restrict access to the affected media library endpoint and ensure only appropriate authenticated roles have upload and browse privileges. Follow the vendor’s documentation for media library permission configuration and validate that inherited or default permissions do not expose upload capability to unauthenticated users. If possible, upgrade to a supported Kentico version and apply any vendor guidance relevant to hardening media library access.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Kentico SoftwareKenticoapplication

Kentico SoftwareXperienceapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

2 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2