Unrated

Arbitrary Code Execution via Unrestricted File Upload in Adobe ColdFusion

IdentifiersCVE-2026-48276CWE-434

CVE-2026-48276 is a critical unrestricted upload of file with dangerous type vulnerability in Adobe ColdFusion. It affects ColdFusion 2025 Update 9 and earlier and ColdFusion 2023 Update 20 and earlier. The flaw allows an attacker to upload a dangerous file type to a vulnerable ColdFusion instance, which can then be executed to achieve arbitrary code execution in the context of the current user. The issue is remotely exploitable over the network, requires no privileges, and does not require user interaction. Supporting content identifies the weakness as CWE-434 and notes a CVSS 3.1 score of 10.0 with scope changed.

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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.

Successful exploitation can result in arbitrary code execution on the affected ColdFusion server in the context of the current user. Given the stated high confidentiality, integrity, and availability impacts, an attacker could run malicious payloads, compromise application data, alter server-side content or logic, and disrupt service operation. The broader advisory context also indicates these ColdFusion critical flaws can enable remote unauthenticated code execution on unpatched systems.

Mitigation

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

If patching cannot be completed immediately, restrict and harden file upload functionality to deny dangerous executable file types, review and harden server security settings, apply Adobe ColdFusion security configuration and Lockdown Guide recommendations, update the ColdFusion JDK/JRE LTS version to the latest supported release, use the latest MySQL Java connector, and for JEE installations configure the documented JVM serial filter flag recommended by Adobe. These measures are compensating controls and do not replace the vendor patch.

Remediation

Patch, then assume compromise.

Upgrade Adobe ColdFusion 2025 to Update 10 or later and Adobe ColdFusion 2023 to Update 21 or later. Adobe’s advisory identifies these releases as containing the fix for CVE-2026-48276. Administrators should apply the vendor security update immediately in accordance with Adobe’s Priority 1 guidance.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

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

AdobeColdfusionapplication

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

ACTIVITY FEED

Recent activity

12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

12 SOURCESView more in app

the hacker newsNews

Jul 1, 2026

Adobe Patches 7 CVSS 10.0 Flaws in ColdFusion and Campaign Classic

An unrestricted upload of file with dangerous type vulnerability in Adobe ColdFusion that could lead to arbitrary code execution.

cyber security newsNews

Jul 1, 2026

Critical Multiple Adobe ColdFusion Vulnerabilities Enables Arbitrary Code Execution Attacks

A critical unrestricted file upload vulnerability in Adobe ColdFusion that can lead to arbitrary code execution.

security weekNews

Jul 1, 2026

Adobe Patches Critical ColdFusion, Campaign Classic Vulnerabilities - SecurityWeek

A critical Adobe ColdFusion vulnerability that could lead to arbitrary code execution; Adobe says these flaws are rooted in unrestricted upload of dangerous file types, improper input validation, and path traversal weaknesses.

bleeping computerNews

Jul 1, 2026

Adobe patches seven max severity ColdFusion, Campaign flaws

A maximum-severity Adobe ColdFusion vulnerability that can allow unauthenticated remote code execution on unpatched systems.

+1 more in the timeline

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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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 activity6

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-48276

NVD

nvd.nist.gov/vuln/detail/CVE-2026-48276

MITRE CWE · CWE-434

cwe.mitre.org