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CVE-2026-21279 – Security Feature Bypass / Unauthorized Data Access – Adobe ColdFusion 2025 (≤2025.0

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Summary

CVE-2026-21279 is an improper input validation flaw (CWE-20) in Adobe ColdFusion that allows an attacker to bypass a security feature and obtain unauthorized read access along with limited write access to affected systems. The flaw is remotely exploitable over the network, requires no authentication, and needs no user interaction, making it a high-severity issue for internet-exposed ColdFusion deployments.

Technical details

  • Root cause: improper validation of input allows a security control to be bypassed (CWE-20).
  • Trigger conditions: no privileges required (PR:N) and no user interaction required (UI:N); attack complexity is low (AC:L).
  • Attack vector: network (AV:N) — exploitable remotely against a reachable ColdFusion instance.
  • Impact: high confidentiality impact (unauthorized read access) and low integrity impact (limited write access); no direct impact on availability.

Affected software

  • Adobe ColdFusion 2025 — versions 0 through 2025.0.11 (fixed in 2025.0.12)
  • Adobe ColdFusion 2023 — versions 0 through 2023.0.22 (fixed in 2023.0.23)

Severity

CVSS v3.1 Base Score: 8.2 (High)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate: Upgrade ColdFusion 2025 installations to version 2025.0.12 or later, and ColdFusion 2023 installations to version 2023.0.23 or later, per Adobe Security Bulletin APSB26-90.
  • If immediate patching is not possible: restrict network exposure of ColdFusion administrative and application endpoints to trusted networks only, and monitor for unusual read/write activity until the update can be applied.

References

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