CVE-2026-84739: GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19

Routine

HIGH 8.7UPGRADE

CVE-2026-84739 is a high-severity flaw (CVSS 8.7) affecting gitlab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-09-29
Last modified	2026-10-05

Publisher (CNA): GitLab Inc. · Vendor: gitlab

Last updated 2026-10-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-29 10:17 UTCPublished CVE record published
2026-10-05 17:06 UTCUpdated Record last modified

gitlab gitlab UPGRADE

Affected: >= 13.11.0 and < 19.2.7 · >= 19.3.0 and < 19.3.3 · 19.4.0

Fixed in: 19.2.7, 19.3.3

Safe to downgrade to: a release before 13.11.0

1. Check installed version

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

2. UPGRADE to 19.2.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gitlab

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gitlab

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 13.11.0 (Debian / Ubuntu)

apt-cache madison gitlab sudo apt install gitlab=<VERSION_BEFORE_13.11.0> sudo apt-mark hold gitlab

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

dnf --showduplicates list gitlab sudo dnf downgrade gitlab-<VERSION_BEFORE_13.11.0> sudo dnf versionlock add gitlab

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.

Advisories and coverage

Official advisories

GitLab Security Releases: GitLab Critical Patch Release: 19.4.1, 19.3.3, 19.2.7 2026-09-23

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-2026-84739?

gitlab: upgrade to 19.2.7, 19.3.3. Exact commands for each OS are on this page.

Is CVE-2026-84739 being exploited?

CVE-2026-84739 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-2026-84739 affect?

CVE-2026-84739 affects gitlab. Severity is high (CVSS 8.7). GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScrip

How urgent is CVE-2026-84739?

Priority 37/100. High severity

Software pages

GitLab vulnerabilities

Related CVEs

CVE-2026-10086 HIGH 8.7 UPGRADE GitLab has remediated an issue in GitLab EE affecting all versions from 16.4 before 18.11.6, 19.0 before 19.0.
CVE-2026-6896 HIGH 8.7 UPGRADE GitLab has remediated an issue in GitLab EE affecting all versions from 13.11 before 18.11.7, 19.0 before 19.0
CVE-2026-84284 MEDIUM 5.3 UPGRADE GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.11 before 19.2.8, 19.3 before 19
CVE-2026-82632 LOW 3.1 UPGRADE GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.9 before 19.2.8, 19.3 before 19.
CVE-2026-78335 MEDIUM 4.2 UPGRADE GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.1 before 19.2.8, 19.3 before 19.

References

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