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PatchSiren cyber security CVE debrief

CVE-2025-56536 OpenNebula CVE debrief

A stored cross-site scripting (XSS) vulnerability in opennebula v6.10.0.1 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the user information parameter. The CVSS score is 6.1, indicating a medium severity vulnerability. This vulnerability can be exploited by attackers to inject malicious scripts or HTML into user information parameters, potentially leading to malicious script execution. Defenders responsible for OpenNebula installations should assess exposure and prioritize verification and updates to prevent exploitation of this stored XSS vulnerability.

Vendor
OpenNebula
Product
OpenNebula 6.10.0.1
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-29
Original CVE updated
2026-10-23
Advisory published
2026-04-29
Advisory updated
2026-10-23

Who should care

Defenders responsible for OpenNebula installations should assess exposure and prioritize verification and updates to prevent exploitation of this stored XSS vulnerability.

Why it matters

CVE-2025-56536 is a stored XSS vulnerability in OpenNebula that allows attackers to inject crafted payloads into user information parameters, potentially leading to malicious script execution.

  • Potential for attackers to inject malicious scripts or HTML into user information parameters
  • Possible impact on user sessions or sensitive data

Technical summary

The vulnerability is a stored cross-site scripting (XSS) issue in OpenNebula, which allows attackers to inject crafted payloads into user information parameters. This can lead to arbitrary web scripts or HTML execution. The CVSS score of 6.1 indicates a medium severity vulnerability. The vulnerability can be addressed by verifying and updating OpenNebula installations to prevent exploitation.

Defensive priority

Defenders should prioritize verifying and updating OpenNebula installations to prevent exploitation of this stored XSS vulnerability.

Recommended defensive actions

  • Verify OpenNebula installations for vulnerability to CVE-2025-56536
  • Update OpenNebula to a version that addresses the stored XSS vulnerability
  • Monitor OpenNebula user information parameters for suspicious activity

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, including its CVSS score and vector. The vulnerability is a stored cross-site scripting (XSS) issue in OpenNebula, which allows attackers to inject crafted payloads into user information parameters. The official CVE Program record and NVD detail page offer source-provided CVE metadata and source-specific vulnerability assessments. However, the scope of affected systems and specific exploitation

Sources and references

Verified primary and authoritative sources

  • CVE-2025-56536 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-56536

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

  • CVE-2025-56536 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-56536

    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.