CVE-2026-34985: LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- a

Routine

MEDIUM 6.3UPGRADE

CVE-2026-34985 is a medium-severity flaw (CVSS 6.3) affecting loris. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 16.1.0 to before 27.0.3 and 28.0.1, While the frontend of the media module filters files that the user should not have access to, the backend was not applying access checks and it would be possible for someone who should not have access to a file to access it if they know the filename.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: mcgill

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 19:25 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

mcgill loris UPGRADE

Affected: >= 16.1.0 and <= 27.0.2 · 28.0.0

Fixed in: newer than 27.0.2

Safe to downgrade to: a release before 16.1.0

1. Check installed version

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

2. UPGRADE to newer than 27.0.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade loris

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 16.1.0 (Debian / Ubuntu)

apt-cache madison loris sudo apt install loris=<VERSION_BEFORE_16.1.0> sudo apt-mark hold loris

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

dnf --showduplicates list loris sudo dnf downgrade loris-<VERSION_BEFORE_16.1.0> sudo dnf versionlock add loris

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-2026-34985?

loris: upgrade to newer than 27.0.2. Exact commands for each OS are on this page.

Is CVE-2026-34985 being exploited?

CVE-2026-34985 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-2026-34985 affect?

CVE-2026-34985 affects loris. Severity is medium (CVSS 6.3). LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 16.1.0 to before 27.0.3 and 28.0.1, While the frontend of the media module f

How urgent is CVE-2026-34985?

Priority 25/100. No elevated risk signals yet.

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References

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