Secuno
ENNL
Book demo

CVE-2026-35036

Ech0 server-side request forgery (SSRF)

7.5 HIGHPublic exploitEPSS 0.44%
  1. Published6 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Ech0< 4.2.8

Remediation

Fixed in
Ech0≥ 4.2.8

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-8911110.0
The SAP Cloud SDK for Python contains an OAuth2 SSRF vulnerability affecting…
CVE-2026-571438.8
PraisonAI is a multi-agent teams system. Prior to praisonaiagents 1.6.62,…
CVE-2026-1092388.6
Crawl4AI 0.7.0 before 0.9.4 contains a server-side request forgery vulnerability that…
CVE-2026-859528.5
Affected Linux-based Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x…
CVE-2026-859518.5
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7…
CVE-2026-694359.6
Missing authorization in Azure SRE Agent allows an authorized attacker to elevate…

Frequently asked

Is CVE-2026-35036 being actively exploited?

CVE-2026-35036 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.44%.

How severe is CVE-2026-35036?

CVE-2026-35036 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.44% probability of exploitation.

Which products are affected by CVE-2026-35036?

Affected products include Ech0.

How do I fix CVE-2026-35036?

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-2026-35036 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.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

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