CVE-2026-10585: A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authent

Routine

MEDIUM 5.4UPGRADE

CVE-2026-10585 is a medium-severity flaw (CVSS 5.4) affecting enterprise server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to execute arbitrary JavaScript in another user's browser by injecting a crafted payload into the title of a Discussion in the Q&A category. The AnsweredQuestionStructuredDataComponent did not escape user-controlled Discussion titles before embedding them in a <script type="application/ld+json"> block, allowing the title t

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-30
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-30 22:16 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

github enterprise server UPGRADE

Affected: < 3.16.20 · >= 3.17.0 and < 3.17.17 · >= 3.18.0 and < 3.18.11 · >= 3.19.0 and < 3.19.8 · >= 3.20.0 and < 3.20.4

Fixed in: 3.16.20, 3.17.17, 3.18.11, 3.19.8, 3.20.4

Safe to downgrade to: a release before 3.17.0

1. Check installed version

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

2. UPGRADE to 3.16.20 (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 3.17.0 (Debian / Ubuntu)

apt-cache madison enterprise-server sudo apt install enterprise-server=<VERSION_BEFORE_3.17.0> 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_3.17.0> 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-2026-10585?

enterprise server: upgrade to 3.16.20, 3.17.17, 3.18.11, 3.19.8, 3.20.4. Exact commands for each OS are on this page.

Is CVE-2026-10585 being exploited?

CVE-2026-10585 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-2026-10585 affect?

CVE-2026-10585 affects enterprise server. Severity is medium (CVSS 5.4). A stored cross-site scripting vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to execute arbitrary JavaScript in another user's browser by injecting a crafted payload into the title of a Discu

How urgent is CVE-2026-10585?

Priority 25/100. No elevated risk signals yet.

Software pages

GitHub vulnerabilities

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References

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