CVE-2026-35400: LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- a

Routine

LOW 3.5UPGRADE

CVE-2026-35400 is a low-severity flaw (CVSS 3.5) 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 20.0.0 to before 27.0.3 and 28.0.1, an endpoint in the publication module was incorrectly trusting the baseURL submitted by a user's POST request rather than the internal LORIS value. This could result in a theoretical attacker with publication module access forging an email to an exte

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-59
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: >= 20.0.0 and <= 27.0.2 · 28.0.0

Fixed in: newer than 27.0.2

Safe to downgrade to: a release before 20.0.0

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 20.0.0 (Debian / Ubuntu)

apt-cache madison loris sudo apt install loris=<VERSION_BEFORE_20.0.0> 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_20.0.0> 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-2026-35400?

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

Is CVE-2026-35400 being exploited?

CVE-2026-35400 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-2026-35400 affect?

CVE-2026-35400 affects loris. Severity is low (CVSS 3.5). LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 20.0.0 to before 27.0.3 and 28.0.1, an endpoint in the publication module wa

How urgent is CVE-2026-35400?

Priority 15/100. No elevated risk signals yet.

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References

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