How severe is CVE-2026-35036?

CVE-2026-35036 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-35036 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35036?

CVE-2026-35036 affects Ech0. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35036?

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-2026-35036 have an EU (EUVD) identifier?

Yes. CVE-2026-35036 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19376.

When was CVE-2026-35036 published?

CVE-2026-35036 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-35036

CVE-2026-35036 is a high-severity vulnerability in Ech0 with a CVSS 3.x base score of 7.5. 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 7.5)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19376
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, Ech0 implements link preview (editor fetches a page title) through GET /api/website/title. That is legitimate product behavior, but the implementation is unsafe: the route is unauthenticated, accepts a fully attacker-controlled URL, performs a server-side GET, reads the entire response body into memory (io.ReadAll). There is no host allowlist, no SSRF filter, and InsecureSkipVerify: true on the outbound client. Anyone who can reach the instance can force the Ech0 server to open HTTP/HTTPS URLs of their choice as seen from the server’s network position (Docker bridge, VPC, localhost from the process view). This vulnerability is fixed in 4.2.8.

Frequently asked questions

What is CVE-2026-35036?: Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to 4.2.8, Ech0 implements link preview (editor fetches a page title) through GET /api/website/title. That is legitimate product behavior, but the implementation is unsafe: the route is unauthenticated, accepts a fully attacker-controlled URL, performs a server-side GET, reads the entire response body into memory (io.ReadAll). There is no host allowlist, no SSRF filter, and InsecureSkipVerify: true on the outbound client. Anyone who can reach the instance can force the Ech0 server to open HTTP/HTTPS URLs of their choice as seen from the server’s network position (Docker bridge, VPC, localhost from the process view). This vulnerability is fixed in 4.2.8.
How severe is CVE-2026-35036?: CVE-2026-35036 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-35036 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35036?: CVE-2026-35036 affects Ech0. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35036?: 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-2026-35036 have an EU (EUVD) identifier?: Yes. CVE-2026-35036 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19376.
When was CVE-2026-35036 published?: CVE-2026-35036 was published on 2026-04-06 and last updated on 2026-06-17.

References

https://github.com/lin-snow/Ech0/security/advisories/GHSA-wc4h-2348-jc3p

Affected products (1)

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

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