How severe is CVE-2026-35446?

CVE-2026-35446 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-35446 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35446?

CVE-2026-35446 primarily affects Mcgill Loris. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-35446?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35446 have an EU (EUVD) identifier?

Yes. CVE-2026-35446 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20580.

When was CVE-2026-35446 published?

CVE-2026-35446 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-35446

CVE-2026-35446 is a high-severity vulnerability in Mcgill Loris with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-552.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20580
Weakness: CWE-552
Affected product: Mcgill Loris
Published: 2026-04-08
Last modified: 2026-06-17

Description

LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 24.0.0 to before 27.0.3 and 28.0.1, an incorrect order of operations in the FilesDownloadHandler could result in an attacker escaping the intended download directories. This vulnerability is fixed in 27.0.3 and 28.0.1.

Frequently asked questions

What is CVE-2026-35446?: LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 24.0.0 to before 27.0.3 and 28.0.1, an incorrect order of operations in the FilesDownloadHandler could result in an attacker escaping the intended download directories. This vulnerability is fixed in 27.0.3 and 28.0.1.
How severe is CVE-2026-35446?: CVE-2026-35446 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-35446 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35446?: CVE-2026-35446 primarily affects Mcgill Loris. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-35446?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35446 have an EU (EUVD) identifier?: Yes. CVE-2026-35446 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20580.
When was CVE-2026-35446 published?: CVE-2026-35446 was published on 2026-04-08 and last updated on 2026-06-17.

References

https://github.com/aces/Loris/security/advisories/GHSA-47jj-7xfg-8759

Affected products (2)

cpe:2.3:a:mcgill:loris:*:*:*:*:*:*:*:*
cpe:2.3:a:mcgill:loris:28.0.0:*:*:*:*:*:*:*

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