CVE-2026-8106: A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console log

Routine

MEDIUM 6.1UPGRADE

CVE-2026-8106 is a medium-severity flaw (CVSS 6.1) affecting enterprise server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter thei

Why this priority

No elevated risk signals yet

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 94%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-07
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. (Products Only) · Vendor: github

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-07 22:16 UTCPublished CVE record published
2026-10-26 20:10 UTCUpdated Record last modified

github enterprise server UPGRADE

Affected: >= 3.19.1 and < 3.19.6 · >= 3.20.0 and < 3.20.2

Fixed in: 3.19.6, 3.20.2

Safe to downgrade to: a release before 3.19.1

1. Check installed version

apt-cache policy enterprise-server || rpm -q enterprise-server || enterprise-server --version

2. UPGRADE to 3.19.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade enterprise-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade enterprise-server

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 3.19.1 (Debian / Ubuntu)

apt-cache madison enterprise-server sudo apt install enterprise-server=<VERSION_BEFORE_3.19.1> sudo apt-mark hold enterprise-server

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

dnf --showduplicates list enterprise-server sudo dnf downgrade enterprise-server-<VERSION_BEFORE_3.19.1> sudo dnf versionlock add enterprise-server

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-2026-8106?

enterprise server: upgrade to 3.19.6, 3.20.2. Exact commands for each OS are on this page.

Is CVE-2026-8106 being exploited?

CVE-2026-8106 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-2026-8106 affect?

CVE-2026-8106 affects enterprise server. Severity is medium (CVSS 6.1). A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTM

How urgent is CVE-2026-8106?

Priority 23/100. No elevated risk signals yet.

Software pages

GitHub vulnerabilities

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References

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