CVE-2020-8788: Synaptive Medical ClearCanvas ImageServer 3.0 Alpha allows XSS (and HTML injection) via the Default.aspx UserN

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MEDIUM 6.1DOWNGRADE

CVE-2020-8788 is a medium-severity flaw (CVSS 6.1) affecting clearcanvas. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Synaptive Medical ClearCanvas ImageServer 3.0 Alpha allows XSS (and HTML injection) via the Default.aspx UserName parameter. NOTE: the issues/227 reference does not imply that the affected product can be downloaded from GitHub. It was simply a convenient location for a public bug report.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-02-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: synaptivemedical

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-02-07 14:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

synaptivemedical clearcanvas DOWNGRADE

Affected: 3.0 alpha

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison clearcanvas sudo apt install clearcanvas=<VERSION_BEFORE_3.0> sudo apt-mark hold clearcanvas

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

dnf --showduplicates list clearcanvas sudo dnf downgrade clearcanvas-<VERSION_BEFORE_3.0> sudo dnf versionlock add clearcanvas

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-2020-8788?

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

Is CVE-2020-8788 being exploited?

CVE-2020-8788 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-2020-8788 affect?

CVE-2020-8788 affects clearcanvas. Severity is medium (CVSS 6.1). Synaptive Medical ClearCanvas ImageServer 3.0 Alpha allows XSS (and HTML injection) via the Default.aspx UserName parameter. NOTE: the issues/227 reference does not imply that the affected product can be downloaded from GitHub. It was simpl

How urgent is CVE-2020-8788?

Priority 41/100. Public exploit reference

Software pages

GitHub vulnerabilities

References

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