HOMEVULNERABILITIESCVE-2026-33537
MEDIUM

CVE-2026-33537

CWE-918Published: March 26, 2026· Updated: Apr 1, 2026

5.0
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:11.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-33537 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeChanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Affected Vendors & Products

lycheeorg1 product
lychee
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/LycheeOrg/Lychee/commit/41386677681d18cd04e42a35b50bd88bf53a4a6a
PATCHhttps://github.com/LycheeOrg/Lychee/security/advisories/GHSA-vq6w-prpf-h287

All References (2)

→
https://github.com/LycheeOrg/Lychee/commit/41386677681d18cd04e42a35b50bd88bf53a4a6aPatch
→
https://github.com/LycheeOrg/Lychee/security/advisories/GHSA-vq6w-prpf-h287Exploit · Mitigation · Patch · Vendor Advisory

Quick Facts

CVE IDCVE-2026-33537
CVSS Score5.0 / 10
SeverityMEDIUM
WeaknessCWE-918
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 26, 2026

Related CVEs (CWE-918)

CVE-2026-35431
10.0
CVE-2026-26150
10.0
CVE-2026-32871
10.0
CVE-2026-26138
10.0
CVE-2026-32169
10.0
CVE-2026-13773
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33537 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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