ColdFusion versions 2023.18, 2025.6 and earlier are affected by an Improper Input Validation…
CVE-2026-27304 is a critical-severity improper input validation vulnerability in ColdFusion 2025 from Adobe, with a CVSS 3.1 base score of 9.3 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected ColdFusion 2025 versions: 6 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 3.81% chance of exploitation within 30 days, which is in the top 9.8% of all scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of ColdFusion 2025 you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on helpx.adobe.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Adobe | ColdFusion 2025 | 6 and earlier | Not stated |
| Adobe | ColdFusion 2023 | 18 and earlier | Not stated |
| Adobe | Coldfusion | 2023; 2025 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- AdjacentThe attacker must be on the same local network segment.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N. Scored by CNA (adobe.com).
Official description
ColdFusion versions 2023.18, 2025.6 and earlier are affected by an Improper Input Validation vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue does not require user interaction.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
How developers prevent this class of flaw
- Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build recognizers for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of allowing parser code to be scattered throughout the program, where it could be subject to errors or inconsistencies that create weaknesses.
- Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
- Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in ColdFusion 2025
- 9.3 Critical severity
- 7.1 High severity
- 7.5 High severity
- 8.4 High severity
- 9.6 Critical severity
- 7.6 High severity
Recent Improper Input Validation vulnerabilities
- 9.6 Critical severity
- 8.8 High severity
- 8.4 High severity
- 7.5 High severity
- 7.5 High severity
- 6.5 Medium severity
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