CVE-2025-56537: A stored cross-site scripting (XSS) vulnerability in opennebula v6.10.0.1 and fixed in v.7.0 allows attackers

Q: How do I fix CVE-2025-56537?

opennebula: upgrade to 7.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-56537 being exploited?

CVE-2025-56537 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-56537 affect?

CVE-2025-56537 affects opennebula. Severity is medium (CVSS 6.1). A stored cross-site scripting (XSS) vulnerability in opennebula v6.10.0.1 and fixed in v.7.0 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the virtual network template parameter.

Q: How urgent is CVE-2025-56537?

Priority 28/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2025-56537 is a medium-severity flaw (CVSS 6.1) affecting opennebula. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stored cross-site scripting (XSS) vulnerability in opennebula v6.10.0.1 and fixed in v.7.0 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the virtual network template parameter.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-29
Last modified	2026-10-15

Publisher (CNA): MITRE · Vendor: opennebula

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-29 16:16 UTCPublished CVE record published
2026-10-15 19:10 UTCUpdated Record last modified

opennebula opennebula UPGRADE

Affected: < 7.0.0

Fixed in: 7.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy opennebula || rpm -q opennebula || opennebula --version

2. UPGRADE to 7.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opennebula

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opennebula

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-56537?

opennebula: upgrade to 7.0.0. Exact commands for each OS are on this page.

Is CVE-2025-56537 being exploited?

CVE-2025-56537 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-56537 affect?

CVE-2025-56537 affects opennebula. Severity is medium (CVSS 6.1). A stored cross-site scripting (XSS) vulnerability in opennebula v6.10.0.1 and fixed in v.7.0 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the virtual network template parameter.

How urgent is CVE-2025-56537?

Priority 28/100. Public exploit reference

Related CVEs

CVE-2025-56536 MEDIUM 6.1 UPGRADE A stored cross-site scripting (XSS) vulnerability in opennebula v6.10.0.1 allows attackers to execute arbitrar
CVE-2025-56535 MEDIUM 6.1 UPGRADE A cross-site scripting (XSS) vulnerability in opennebula v6.10.0.1 allows attackers to execute arbitrary web s
CVE-2025-56534 MEDIUM 6.1 UPGRADE A cross-site scripting (XSS) vulnerability in the custom authenticator driver of opennebula v6.10.0.1 allows a

References

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