CVE-2025-30028: A vulnerability in Active Backup for Business allows unauthorized remote attackers to read arbitrary files.

This month

HIGH 8.6REMOTEDOWNGRADE

CVE-2025-30028 is a high-severity flaw (CVSS 8.6) affecting active backup for business. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in Active Backup for Business allows unauthorized remote attackers to read arbitrary files.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-89
Published	2026-05-27
Last modified	2026-10-07

Publisher (CNA): Synology Inc. · Vendor: synology

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 09:16 UTCPublished CVE record published
2026-10-07 08:10 UTCUpdated Record last modified

synology active backup for business DOWNGRADE

Affected: 2.7.1-23234 · 2.7.1-13234 · 2.7.1-3234

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7.1-3234

1. Check installed version

apt-cache policy active-backup-for-business || rpm -q active-backup-for-business || active-backup-for-business --version

2. No fixed release: DOWNGRADE to a release before 2.7.1-3234 (Debian / Ubuntu)

apt-cache madison active-backup-for-business sudo apt install active-backup-for-business=<VERSION_BEFORE_2.7.1-3234> sudo apt-mark hold active-backup-for-business

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list active-backup-for-business sudo dnf downgrade active-backup-for-business-<VERSION_BEFORE_2.7.1-3234> sudo dnf versionlock add active-backup-for-business

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-30028?

active backup for business: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-30028 being exploited?

CVE-2025-30028 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-2025-30028 affect?

CVE-2025-30028 affects active backup for business. Severity is high (CVSS 8.6). A vulnerability in Active Backup for Business allows unauthorized remote attackers to read arbitrary files.

How urgent is CVE-2025-30028?

Priority 43/100. High severity; Remotely exploitable, no login, no user action

Software pages

Synology vulnerabilities

References

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