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PatchSiren cyber security CVE debrief

CVE-2026-19852 CyberTutor CVE debrief

CVE-2026-19852 is a medium-severity vulnerability in NewSiteServer (NSS) developed by CyberTutor, allowing unauthenticated remote attackers to upload arbitrary files, including malicious HTML files, potentially leading to cross-site scripting effects. The vulnerability affects NSS deployments, especially those with internet-facing interfaces. Defenders should assess exposure and prioritize verification and remediation efforts. The CVE record and NVD entry provide limited information about the vulnerability, with no details on affected or fixed versions, or specific exploitation scenarios. The lack of detailed information necessitates a cautious approach to verifying exposure and

Vendor
CyberTutor
Product
NewSiteServer (NSS)
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-24
Original CVE updated
2026-10-12
Advisory published
2026-08-24
Advisory updated
2026-10-12

Who should care

Defenders responsible for NSS deployments, especially those with internet-facing interfaces, should assess exposure and prioritize verification and remediation efforts.

Why it matters

CVE-2026-19852 is a medium-severity vulnerability in NewSiteServer (NSS) developed by CyberTutor, allowing unauthenticated remote attackers to upload arbitrary files, including malicious HTML files, potentially leading to cross-site scripting effects. Defenders should prioritize verifying exposure of NSS deployments, especially those with internet-facing interfaces, and assess the need for file upload restrictions and content security policies.

  • Potential cross-site scripting effects due to arbitrary file upload
  • Need for file upload restrictions and content security policies
  • Verification of NSS deployments and exposure

Technical summary

The NewSiteServer (NSS) developed by CyberTutor has an Arbitrary File Upload vulnerability, allowing unauthenticated remote attackers to upload arbitrary files, including malicious HTML files, potentially leading to cross-site scripting effects. This vulnerability affects NSS deployments, particularly those with internet-facing interfaces, and defenders should prioritize verifying exposure and assessing the need for file upload restrictions and content security policies. The vulnerability's impact includes potential cross-site scripting effects due to arbitrary

Defensive priority

Defenders should prioritize verifying exposure of NSS deployments, especially those with internet-facing interfaces, and assess the need for file upload restrictions and content security policies.

Recommended defensive actions

  • Verify exposure of NSS deployments, especially those with internet-facing interfaces
  • Assess the need for file upload restrictions and content security policies
  • Monitor for suspicious file upload activity

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with no details on affected or fixed versions, or specific exploitation scenarios.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-19852 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-19852

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

  • CVE-2026-19852 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-19852

    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.