CVE-2025-56534

MEDIUMNVD 6.16.1—Elevated

6.1

A cross-site scripting (XSS) vulnerability in the custom authenticator driver of opennebula v6.10.0.1 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

CVSS v3: 6.1
EG Score: 6.1(high)
EPSS: 9.9%
KEV: Not listed

Published

April 29, 2026

Last Modified

April 30, 2026

Advisory Details (2)

Auto-updated Apr 30, 2026

🔬 Proof of concept available. No patch confirmed yet.

generic🟡 PoC Available

GitHub - MarkArtamonov/OpenNebula-CVE-2025-56534 · GitHub

https://github.com/MarkArtamonov/OpenNebula-CVE-2025-56534

generic

OpenNebula 7.0 Phoenix Release

https://opennebula.io/opennebula-7/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-79Cross-site Scripting (XSS)

Data Freshness Timeline

(refreshed 19× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:16 UTCepss_batch
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2026-05-24 16:57 UTCepss_batch

Frequently asked(5)

What is CVE-2025-56534?

CVE-2025-56534 is a medium vulnerability published on April 29, 2026. A cross-site scripting (XSS) vulnerability in the custom authenticator driver of opennebula v6.10.0.1 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

When was CVE-2025-56534 disclosed?

CVE-2025-56534 was first published in the National Vulnerability Database on April 29, 2026, with the most recent update on April 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-56534 actively exploited?

CVE-2025-56534 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-56534?

CVE-2025-56534 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2025-56534?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-56534, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-56534

📅 Published

🔄 Last Modified

📋 Advisory Details (2)