CVE-2025-66486: IBM Aspera Shares 1.9.9 through 1.11.0 is vulnerable to HTML injection

Routine

MEDIUM 4.8UPGRADE

CVE-2025-66486 is a medium-severity flaw (CVSS 4.8) affecting aspera shares. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM Aspera Shares 1.9.9 through 1.11.0 is vulnerable to HTML injection. A remote attacker could inject malicious HTML code, which when viewed, would be executed in the victim's Web browser within the security context of the hosting site.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-80
Published	2026-04-01
Last modified	2026-10-07

Publisher (CNA): IBM Corporation · Vendor: ibm

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

Am I affected?

Timeline

2026-04-01 23:17 UTCPublished CVE record published
2026-10-07 09:10 UTCUpdated Record last modified

ibm aspera shares UPGRADE

Affected: >= 1.9.9 and < 1.11.1

Fixed in: 1.11.1

Safe to downgrade to: a release before 1.9.9

1. Check installed version

apt-cache policy aspera-shares || rpm -q aspera-shares || aspera-shares --version

2. UPGRADE to 1.11.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade aspera-shares

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade aspera-shares

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.9.9 (Debian / Ubuntu)

apt-cache madison aspera-shares sudo apt install aspera-shares=<VERSION_BEFORE_1.9.9> sudo apt-mark hold aspera-shares

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list aspera-shares sudo dnf downgrade aspera-shares-<VERSION_BEFORE_1.9.9> sudo dnf versionlock add aspera-shares

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-2025-66486?

aspera shares: upgrade to 1.11.1. Exact commands for each OS are on this page.

Is CVE-2025-66486 being exploited?

CVE-2025-66486 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-2025-66486 affect?

CVE-2025-66486 affects aspera shares. Severity is medium (CVSS 4.8). IBM Aspera Shares 1.9.9 through 1.11.0 is vulnerable to HTML injection. A remote attacker could inject malicious HTML code, which when viewed, would be executed in the victim's Web browser within the security context of the hosting site.

How urgent is CVE-2025-66486?

Priority 21/100. No elevated risk signals yet.

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References

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