How severe is CVE-2026-33537?

CVE-2026-33537 has a CVSS 3.x base score of 5.0, 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-2026-33537 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33537?

CVE-2026-33537 affects Lycheeorg Lychee. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33537?

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

Does CVE-2026-33537 have an EU (EUVD) identifier?

Yes. CVE-2026-33537 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16369.

When was CVE-2026-33537 published?

CVE-2026-33537 was published on 2026-03-26 and last updated on 2026-06-17.

CVE-2026-33537

CVE-2026-33537 is a medium-severity vulnerability in Lycheeorg Lychee with a CVSS 3.x base score of 5.0. 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-918.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
CVSS v4: 5.3
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16369
Weakness: CWE-918
Affected product: Lycheeorg Lychee
Published: 2026-03-26
Last modified: 2026-06-17

Description

Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via `Photo::fromUrl`) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.

Frequently asked questions

What is CVE-2026-33537?: Lychee is a free, open-source photo-management tool. The patch introduced for GHSA-cpgw-wgf3-xc6v (SSRF via `Photo::fromUrl`) contains an incomplete IP validation check that fails to block loopback addresses and link-local addresses. Prior to version 7.5.1, an authenticated user can still reach internal services using direct IP addresses, bypassing all four protection configuration settings even when they are set to their secure defaults. Version 7.5.1 contains a fix for the issue.
How severe is CVE-2026-33537?: CVE-2026-33537 has a CVSS 3.x base score of 5.0, 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-2026-33537 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33537?: CVE-2026-33537 affects Lycheeorg Lychee. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33537?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33537 have an EU (EUVD) identifier?: Yes. CVE-2026-33537 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16369.
When was CVE-2026-33537 published?: CVE-2026-33537 was published on 2026-03-26 and last updated on 2026-06-17.

References

Affected products (1)

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

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