Security readout for executives and security teams
Plain-English summary
Affected Adobe ColdFusion servers could let an attacker on an adjacent network run arbitrary code with the ColdFusion process user's permissions. No user action is required. Successful exploitation could expose or alter sensitive data, although the supplied CVSS vector does not claim a direct availability impact.
Executive priority
Treat as an urgent remediation item for affected or potentially affected ColdFusion systems. Prioritize shared-network and sensitive-data environments. Confirm inventory and vendor update status promptly, while avoiding unsupported assumptions about internet exploitability or active attacks.
Technical view
CVE-2026-27304 is an improper input validation flaw affecting ColdFusion 2023.18, 2025.6, and earlier releases. It has CVSS 3.1 score 9.3: adjacent-network access, low complexity, no privileges, no user interaction, changed scope, and high confidentiality and integrity impact. The supplied sources do not describe the vulnerable input or exploitation mechanics.
Likely exposure
Exposure is highest where affected ColdFusion instances are reachable from adjacent or shared networks. The CVSS vector does not classify this as directly internet-remotely exploitable. Risk also depends on the permissions and accessible resources of the account running ColdFusion.
Exploitation context
The supplied bundle does not identify known active exploitation, and the CVE is not listed as KEV. Exploitation requires no authentication or user interaction but is classified as adjacent-network, not unrestricted remote network access. No public exploit details are established by the supplied evidence.
Researcher notes
The explicit description identifies 2023.18 and 2025.6 and earlier as affected. The bundle's structured affected-version entries are ambiguous and should not be used alone to infer fixed releases. Consult APSB26-38 for authoritative version guidance. Available evidence provides no vulnerable endpoint, input path, proof of concept, or confirmed exploitation telemetry.
Mitigation direction
- Inventory ColdFusion installations and identify versions 2023.18, 2025.6, or earlier.
- Review Adobe APSB26-38 and apply the vendor-supported update for each deployed branch.
- Until updated, restrict ColdFusion access to required trusted networks and systems.
- Minimize the ColdFusion service account's privileges and access to sensitive resources.
Validation and detection
- Verify each ColdFusion instance's exact installed version against Adobe APSB26-38.
- Confirm network controls prevent access from untrusted or unnecessary adjacent systems.
- Review ColdFusion and host logs for unexplained code execution or configuration changes.
- Confirm the ColdFusion process account has only operationally necessary permissions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27304 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N2.85.8adobeVulnerability scoring details
Base CVSS 3.1 score
9.3CriticalVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/coldfusion/apsb26-38.htmlCVE reference, adobe · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.