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CVE-2026-35037

Ech0 server-side request forgery (SSRF)

7.2 HIGHPublic exploitEPSS 0.72%
  1. Published6 Apr 2026

Description

Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, the GET /api/website/title endpoint accepts an arbitrary URL via the website_url query parameter and makes a server-side HTTP request to it without any validation of the target host or IP address. The endpoint requires no authentication. An attacker can use this to reach internal network services, cloud metadata endpoints (169.254.169.254), and localhost-bound services, with partial response data exfiltrated via the HTML <title> tag extraction This vulnerability is fixed in 4.2.8.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

Ech0< 4.2.8

Remediation

Fixed in
Ech0≥ 4.2.8

References

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Frequently asked

Is CVE-2026-35037 being actively exploited?

CVE-2026-35037 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.72%.

How severe is CVE-2026-35037?

CVE-2026-35037 has a CVSS 3.1 base score of 7.2, rated high. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2026-35037?

Affected products include Ech0.

How do I fix CVE-2026-35037?

Upgrade affected software to a fixed version, for example Ech0 4.2.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-35037 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.