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Adobe ColdFusion CVE-2026-48282: CVSS 10.0 Exploited in 2hr

August 1, 2026•5 min read
security adobe coldfusion cve-2026-48282 zero-day rce

Adobe ColdFusion CVE-2026-48282: CVSS 10.0 Zero-Day Exploited in Two Hours

Adobe ColdFusion CVE-2026-48282 is a maximum-severity path traversal vulnerability in the Remote Development Services (RDS) module that allows unauthenticated attackers to achieve remote code execution. Tracked with a CVSS score of 10.0, this flaw was actively exploited in the wild within two hours of public disclosure, making it one of the fastest weaponization timelines observed in 2026.

Vulnerability Details

CVE-2026-48282 resides in the RDS (Remote Development Services) component of Adobe ColdFusion, specifically within the FileServlet class that handles FILEIO operations. The vulnerability is a path traversal issue: when RDS is enabled and authentication is disabled, a configuration Adobe explicitly warns against but that administrators sometimes use for convenience, an attacker can send a crafted RDS packet to /CFIDE/main/ide.cfm?ACTION=FILEIO and read or write arbitrary files on the server filesystem.

The RDS protocol uses a simple length-prefixed binary format over HTTP POST. A FILEIO request with the READ operation and a path like C:\\Windows\\win.ini or ../../../etc/passwd would previously pass directly to FileServlet.getFile(filename) without canonicalization. The patched version routes the path through RdsFileSecurity.resolveCanonical(), which blocks absolute paths, directory traversal sequences (../), null bytes, and paths resolving outside the allowed RDS-accessible directory.

Affected versions include Adobe ColdFusion 2025 Update 9 and earlier, and ColdFusion 2023 Update 20 and earlier. Adobe released ColdFusion 2025 Update 10 and ColdFusion 2023 Update 21 on June 30, 2026, as part of security bulletin APSB26-68, which addressed eleven CVEs total: six rated Critical (Arbitrary Code Execution), one Important (Arbitrary File System Read), two Important (Privilege Escalation), one Important (Security Feature Bypass), and one Moderate (Information Disclosure).

Impact Assessment

The impact is severe: unauthenticated remote code execution on the underlying server with the privileges of the ColdFusion service account (often SYSTEM on Windows or root on Linux). Because RDS exposes filesystem read, write, rename, delete, and directory creation operations, an attacker can drop a webshell, modify application code, exfiltrate configuration files containing database credentials, or pivot to connected backend systems.

The vulnerability requires RDS to be enabled and authentication disabled: not the default configuration. However, watchTowr Labs notes that many administrators disable RDS authentication for IDE integration convenience, inadvertently exposing this attack surface. Shadowserver's internet scan identified nearly 800 publicly exposed ColdFusion instances as of early July 2026, though the proportion with vulnerable RDS configurations is unknown.

Affected Systems

Organizations running Adobe ColdFusion 2025 (Update 9 or earlier) or ColdFusion 2023 (Update 20 or earlier) with RDS enabled and authentication disabled are immediately at risk. This includes:

  • Enterprise web applications built on CFML (ColdFusion Markup Language)
  • Government and healthcare systems using ColdFusion for legacy application support
  • Financial services platforms with ColdFusion-based transaction processing
  • Educational institutions running ColdFusion-powered portals

Adobe ColdFusion 2021 reached end of core support in 2025 and is not patched: organizations still on 2021 must upgrade to a supported version.

Mitigation & Patching

Immediate action (priority order):

  1. Apply the vendor patches: Install ColdFusion 2025 Update 10 or ColdFusion 2023 Update 21 from the Adobe ColdFusion updates page. Adobe assigned Priority 1 to this release, recommending deployment within 72 hours.

  2. Disable RDS if not required: In the ColdFusion Administrator, navigate to Security > RDS and uncheck "Enable RDS." This eliminates the attack vector entirely.

  3. Enable RDS authentication: If RDS is required for development workflows, ensure "Require RDS Password" is checked and a strong password is set. The vulnerability is only reachable when RDS authentication is disabled.

  4. Block /CFIDE/ at the network layer: Restrict access to the /CFIDE/main/ endpoint to trusted internal IPs only via WAF rules, firewall policies, or web server configuration (Apache/IIS/Nginx).

  5. Monitor for compromise: Review ColdFusion logs (coldfusion-out.log, application.log) for unusual FILEIO requests, unexpected file creation in webroot, or webshell indicators (.cfm files with cfexecute, createObject(\"java\", ...) patterns).

Detection

Log-based detection: Search ColdFusion access logs for POST requests to /CFIDE/main/ide.cfm?ACTION=FILEIO with suspicious path parameters containing .., absolute paths (C:\\, /etc/), or null bytes (%00).

Network IDS/IPS rules:

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Sigma rule for log sources:

yaml

Frequently Asked Questions

Is CVE-2026-48282 exploitable without authentication? Yes, but only when RDS authentication is explicitly disabled in the ColdFusion Administrator. With RDS authentication enabled (the recommended configuration), valid credentials are required before any FILEIO operation is processed.

Does the patch break legitimate RDS functionality? The patch adds path canonicalization and validation via RdsFileSecurity.resolveCanonical(). Legitimate RDS operations using relative paths within the allowed directory continue to work. Only traversal attempts and absolute paths are blocked.

How many CVEs were fixed in APSB26-68? Eleven total: CVE-2026-48276, CVE-2026-48277, CVE-2026-48281, CVE-2026-48316, CVE-2026-48282, CVE-2026-48283 (Arbitrary Code Execution); CVE-2026-48313 (Arbitrary File System Read); CVE-2026-48315, CVE-2026-48314 (Privilege Escalation); CVE-2026-48285 (Security Feature Bypass); CVE-2026-48307 (Arbitrary Code Execution).

Is ColdFusion 2021 affected? Yes, but it reached end of core support in April 2025 and will not receive a patch. Organizations on ColdFusion 2021 must upgrade to 2023 or 2025.

What is the exploitation timeline? Adobe released the advisory on June 30, 2026. KEVIntel detected in-the-wild exploitation within two hours of public disclosure. CISA added CVE-2026-48282 to the Known Exploited Vulnerabilities (KEV) catalog shortly after. The Canadian Centre for Cyber Security issued alert AV26-647 urging immediate patching.

Can this be exploited via the ColdFusion Administrator interface? No, the vulnerability is in the RDS servlet (/CFIDE/main/ide.cfm), which is separate from the ColdFusion Administrator (/CFIDE/administrator/). However, both reside under /CFIDE/ and should be restricted.

Key Takeaways

  • CVE-2026-48282 is a CVSS 10.0 path traversal in Adobe ColdFusion RDS allowing unauthenticated RCE when RDS auth is disabled.
  • Exploitation began within 2 hours of disclosure: one of the fastest weaponization windows in recent memory.
  • Patch immediately: ColdFusion 2025 Update 10 or 2023 Update 21 (APSB26-68, June 30, 2026).
  • Disable RDS if not needed; enable strong authentication if required.
  • Block /CFIDE/ at the network perimeter for defense-in-depth.
  • Monitor logs for FILEIO requests with traversal patterns.
  • CISA KEV listing means federal agencies must patch by the mandated deadline; private sector should treat with equal urgency.

Conclusion

The Adobe ColdFusion CVE-2026-48282 incident highlights how quickly the disclosure-to-exploitation window has compressed. With KEVIntel capturing exploitation within two hours and CISA adding the flaw to its KEV catalog days later, the message is clear: Priority 1 patches must be deployed in hours, not days. Organizations running ColdFusion should treat this as an active incident: assume compromise if unpatched systems were internet-exposed, and initiate forensic review alongside emergency patching.

Sources:

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