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PatchSiren cyber security CVE debrief

CVE-2023-26359 Adobe CVE debrief

CVE-2023-26359 is an Adobe ColdFusion deserialization of untrusted data vulnerability that CISA added to its Known Exploited Vulnerabilities (KEV) catalog on 2023-08-21. Because it is listed in KEV, defenders should treat it as actively exploited and prioritize remediation. CISA’s required action is to apply mitigations per Adobe’s guidance or discontinue use of the product if mitigations are unavailable.

Vendor
Adobe
Product
ColdFusion
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-08-21
Original CVE updated
2023-08-21
Advisory published
2023-08-21
Advisory updated
2023-08-21

Who should care

Organizations running Adobe ColdFusion, especially internet-facing deployments, should prioritize this CVE immediately. Security operations, patch management, and application owners should also care because CISA classifies it as known exploited.

Technical summary

The supplied corpus identifies the issue as a deserialization of untrusted data vulnerability in Adobe ColdFusion. The CISA KEV record indicates the vulnerability is known exploited and directs defenders to follow Adobe’s mitigation guidance or discontinue use if no mitigation is available. The provided source set does not include vendor bulletin details such as affected versions, exploit mechanism, or patch identifiers.

Defensive priority

Highest. KEV inclusion means this vulnerability should be treated as an urgent remediation item ahead of routine patch queues, especially for exposed ColdFusion instances.

Recommended defensive actions

  • Review Adobe’s official security guidance for CVE-2023-26359 and apply the vendor-recommended mitigations immediately.
  • If mitigations are not available for your deployment, discontinue use of Adobe ColdFusion until a safe remediation path exists.
  • Identify all ColdFusion instances, with special focus on internet-facing systems, and confirm exposure status.
  • Validate that remediation was completed before the CISA KEV due date of 2023-09-11.
  • Monitor logs and security telemetry on affected systems for signs of abuse and investigate any suspicious activity.
  • Track the Adobe advisory and NVD entry for updated technical details and any version-specific guidance.

Evidence notes

Evidence is limited to the supplied CISA KEV record and official resource links. The corpus confirms: vendor Adobe, product ColdFusion, vulnerability name ‘Adobe ColdFusion Deserialization of Untrusted Data Vulnerability,’ KEV dateAdded 2023-08-21, dueDate 2023-09-11, and requiredAction to apply vendor mitigations or discontinue use if mitigations are unavailable. No additional exploit, version, or patch-detail claims are made because they are not present in the supplied source corpus.

Official resources

CISA lists CVE-2023-26359 in its Known Exploited Vulnerabilities catalog, indicating known exploitation. The provided corpus does not include Adobe bulletin text, so this debrief stays limited to the official KEV record and linked public CV