How severe is CVE-2026-35037?

CVE-2026-35037 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-35037 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35037?

CVE-2026-35037 affects Ech0. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35037?

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-2026-35037 have an EU (EUVD) identifier?

Yes. CVE-2026-35037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19378.

When was CVE-2026-35037 published?

CVE-2026-35037 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-35037

CVE-2026-35037 is a high-severity vulnerability in Ech0 with a CVSS 3.x base score of 7.2. 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: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19378
Weakness: CWE-918
Affected product: Ech0
Published: 2026-04-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-35037?: 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.
How severe is CVE-2026-35037?: CVE-2026-35037 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-35037 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35037?: CVE-2026-35037 affects Ech0. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35037?: 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-2026-35037 have an EU (EUVD) identifier?: Yes. CVE-2026-35037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19378.
When was CVE-2026-35037 published?: CVE-2026-35037 was published on 2026-04-06 and last updated on 2026-06-17.

References

https://github.com/lin-snow/Ech0/security/advisories/GHSA-cqgf-f4x7-g6wc

Affected products (1)

cpe:2.3:a:ech0:ech0:*:*:*:*:*:*:*:*

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