How severe is CVE-2026-39957?

CVE-2026-39957 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-39957 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39957?

CVE-2026-39957 affects Lycheeorg Lychee. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39957?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-39957 have an EU (EUVD) identifier?

Yes. CVE-2026-39957 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20954.

When was CVE-2026-39957 published?

CVE-2026-39957 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-39957

CVE-2026-39957 is a medium-severity vulnerability in Lycheeorg Lychee with a CVSS 3.x base score of 4.3. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v4: 2.3
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20954
Weakness: CWE-863
Affected product: Lycheeorg Lychee
Published: 2026-04-09
Last modified: 2026-06-17

Description

Lychee is a free, open-source photo-management tool. Prior to 7.5.4, a SQL operator-precedence bug in SharingController::listAll() causes the orWhereNotNull('user_group_id') clause to escape the ownership filter applied by the when() block. Any authenticated non-admin user with upload permission who owns at least one album can retrieve all user-group-based sharing permissions across the entire instance, including private albums owned by other users. This vulnerability is fixed in 7.5.4.

Frequently asked questions

What is CVE-2026-39957?: Lychee is a free, open-source photo-management tool. Prior to 7.5.4, a SQL operator-precedence bug in SharingController::listAll() causes the orWhereNotNull('user_group_id') clause to escape the ownership filter applied by the when() block. Any authenticated non-admin user with upload permission who owns at least one album can retrieve all user-group-based sharing permissions across the entire instance, including private albums owned by other users. This vulnerability is fixed in 7.5.4.
How severe is CVE-2026-39957?: CVE-2026-39957 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-39957 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39957?: CVE-2026-39957 affects Lycheeorg Lychee. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39957?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39957 have an EU (EUVD) identifier?: Yes. CVE-2026-39957 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20954.
When was CVE-2026-39957 published?: CVE-2026-39957 was published on 2026-04-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lycheeorg:lychee:*:*:*:*:*:*:*:*

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