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PatchSiren cyber security CVE debrief

CVE-2026-20189 Cisco CVE debrief

A vulnerability in the log file download functionality of Cisco Prime Infrastructure could allow an authenticated, remote attacker to download arbitrary log files from the server. This vulnerability is due to insufficient authorization checks on the download service API. An attacker could exploit this vulnerability by submitting a crafted URL request to an affected device. A successful exploit could allow the attacker to download sensitive log files that they would otherwise not have authorization to access. To exploit this vulnerability, the attacker must have valid credentials to access the web-based management interface of the affected device.

Vendor
Cisco
Product
Prime Infrastructure
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-06
Original CVE updated
2026-06-29
Advisory published
2026-05-06
Advisory updated
2026-06-29

Who should care

Security teams and administrators responsible for Cisco Prime Infrastructure systems should be aware of this vulnerability and take steps to mitigate it. This vulnerability could allow attackers to access sensitive log files, potentially leading to further exploitation or data breaches. Affected organizations should prioritize patching and ensure that only authorized personnel have access to log files.

Technical summary

CVE-2026-20189 is a medium-severity vulnerability in Cisco Prime Infrastructure, with a CVSS score of 4.3. The vulnerability is caused by insufficient authorization checks on the download service API, allowing authenticated attackers to download arbitrary log files. The affected products include Cisco Prime Infrastructure versions prior to 3.10.6, with specific CPE criteria listed. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Defensive priority

This vulnerability has a medium severity level, but it could still have significant consequences if exploited. Security teams should prioritize patching and ensure that only authorized personnel have access to log files.

Recommended defensive actions

  • Apply patches or updates to affected Cisco Prime Infrastructure systems
  • Review and restrict access to log files and the web-based management interface
  • Monitor for suspicious activity and implement additional security measures as needed
  • Verify that all users have valid credentials and follow best practices for authentication
  • Consider implementing compensating controls, such as logging and monitoring, to detect potential exploitation

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, including its description, CVSS score, and affected products. The vendor advisory from Cisco provides mitigation guidance and information on affected versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20189 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20189

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-20189 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20189

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.