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CVE-2026-35036

Ech0 Affected by Unauthenticated Server-Side Request Forgery in Website Preview Feature

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.33%Up 0.3 points since Apr 7, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

Ech0 Affected by Unauthenticated Server-Side Request Forgery in Website Preview Feature

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.

Record
CVE-2026-35036
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
EUVDEUVD-2026-19376 7.5

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.

Record
EUVD-2026-19376
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-wc4h-2348-jc3p 7.5

Ech0 has Unauthenticated Server-Side Request Forgery in Website Preview Feature

Summary

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.

Attacker outcome : 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). Go’s default http.Client follows redirects (unless disabled). Redirect chains can move the server-side request from an allowed-looking host to an internal target; the code does not disable this in SendRequest.

Affected Components

Ech0 codebase:

  • internal/handler/common/common.go
    Handles the /api/website/title endpoint and accepts user-controlled URL input.

  • internal/service/common/common.go
    Processes the request and invokes the outbound HTTP fetch (GetWebsiteTitle).

  • internal/util/http/http.go
    Performs the HTTP request (SendRequest) with the following insecure configurations:

    • No URL validation or allowlist
    • Redirects enabled (default client behavior)
    • InsecureSkipVerify: true

PoC

Environment: Ech0 listening on http://127.0.0.1:6277 (e.g. Docker image sn0wl1n/ech0:latest). No cookies or Authorization header.

Step 1 — baseline: unauthenticated server-side fetch (public URL):

curl.exe -sS -m 20 "http://127.0.0.1:6277/api/website/title?website_url=https://example.com"

Observed result (verified): HTTP 200, JSON with code: 1 and data Example Domain — proves the Ech0 process performed an outbound GET without any client auth.

Step 2 — impact: host-bound page + recorded leak (repo PoC file) Committed PoC page: poc_ssrf_proof.html

  1. From poc file directory, listen on 0.0.0.0 (port 9999):
python -m http.server 9999 --bind 0.0.0.0
  1. Docker Desktop (Windows / macOS): Ech0 in Docker fetches the host via host.docker.internal:
curl.exe -sS -m 20 "http://127.0.0.1:6277/api/website/title?website_url=http://host.docker.internal:9999/poc_ssrf_proof.html"

Recorded response (verified this workspace, Ech0 4.2.2 in Docker):

{"code":1,"msg":"获取网站标题成功","data":"ECH0_SSRF_POC_LEAK_2026"}

Python server log: GET /poc_ssrf_proof.html → 200 (proves the server/container pulled the page from your host).

Leak channel: the backend reads the full HTML body before parsing (see io.ReadAll in SendRequest).

Impact

  • Verified: Unauthenticated callers can make the Ech0 process issue server-side HTTP(S) requests to internal/reserved targets reachable from that process (PoC Step 2: host-reachable listener reflected in JSON).
  • Code-level: The full response is read into memory (io.ReadAll); only the title string is returned. Combined with default HTTP redirect following (standard http.Client behavior; not disabled here), the effective request graph is larger than a single URL.
  • TLS: InsecureSkipVerify: true means misissued or intercepted TLS to internal HTTPS services is still accepted from the server’s perspective.
  • Deployment-dependent: Where routing allows (typical cloud VMs), 169.254.169.254-class endpoints are in scope for the same code path; treat as *high.
  • DOS(Denial of Service): reading the whole body into memory with io.ReadAll is a DoS vector if you point it at a massive file.

Remediation

  • Enforce SSRF-safe URL policy: allow only needed schemes/hosts; block link-local, metadata, and loopback unless explicitly required.
  • Remove…
Record
GHSA-wc4h-2348-jc3p
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
NVD 7.5

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.

Record
CVE-2026-35036
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSV 7.5

Ech0 Affected by Unauthenticated Server-Side Request Forgery in Website Preview Feature

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.

Record
CVE-2026-35036
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGHSA-wc4h-2348-jc3p 7.5

Ech0 has Unauthenticated Server-Side Request Forgery in Website Preview Feature

Summary

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.

Attacker outcome : 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). Go’s default http.Client follows redirects (unless disabled). Redirect chains can move the server-side request from an allowed-looking host to an internal target; the code does not disable this in SendRequest.

Affected Components

Ech0 codebase:

  • internal/handler/common/common.go
    Handles the /api/website/title endpoint and accepts user-controlled URL input.

  • internal/service/common/common.go
    Processes the request and invokes the outbound HTTP fetch (GetWebsiteTitle).

  • internal/util/http/http.go
    Performs the HTTP request (SendRequest) with the following insecure configurations:

    • No URL validation or allowlist
    • Redirects enabled (default client behavior)
    • InsecureSkipVerify: true

PoC

Environment: Ech0 listening on http://127.0.0.1:6277 (e.g. Docker image sn0wl1n/ech0:latest). No cookies or Authorization header.

Step 1 — baseline: unauthenticated server-side fetch (public URL):

curl.exe -sS -m 20 "http://127.0.0.1:6277/api/website/title?website_url=https://example.com"

Observed result (verified): HTTP 200, JSON with code: 1 and data Example Domain — proves the Ech0 process performed an outbound GET without any client auth.

Step 2 — impact: host-bound page + recorded leak (repo PoC file) Committed PoC page: poc_ssrf_proof.html

  1. From poc file directory, listen on 0.0.0.0 (port 9999):
python -m http.server 9999 --bind 0.0.0.0
  1. Docker Desktop (Windows / macOS): Ech0 in Docker fetches the host via host.docker.internal:
curl.exe -sS -m 20 "http://127.0.0.1:6277/api/website/title?website_url=http://host.docker.internal:9999/poc_ssrf_proof.html"

Recorded response (verified this workspace, Ech0 4.2.2 in Docker):

{"code":1,"msg":"获取网站标题成功","data":"ECH0_SSRF_POC_LEAK_2026"}

Python server log: GET /poc_ssrf_proof.html → 200 (proves the server/container pulled the page from your host).

Leak channel: the backend reads the full HTML body before parsing (see io.ReadAll in SendRequest).

Impact

  • Verified: Unauthenticated callers can make the Ech0 process issue server-side HTTP(S) requests to internal/reserved targets reachable from that process (PoC Step 2: host-reachable listener reflected in JSON).
  • Code-level: The full response is read into memory (io.ReadAll); only the title string is returned. Combined with default HTTP redirect following (standard http.Client behavior; not disabled here), the effective request graph is larger than a single URL.
  • TLS: InsecureSkipVerify: true means misissued or intercepted TLS to internal HTTPS services is still accepted from the server’s perspective.
  • Deployment-dependent: Where routing allows (typical cloud VMs), 169.254.169.254-class endpoints are in scope for the same code path; treat as *high.
  • DOS(Denial of Service): reading the whole body into memory with io.ReadAll is a DoS vector if you point it at a massive file.

Remediation

  • Enforce SSRF-safe URL policy: allow only needed schemes/hosts; block link-local, metadata, and loopback unless explicitly required.
  • Remove…
Record
GHSA-wc4h-2348-jc3p
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGO-2026-5704 No score

Ech0 has Unauthenticated Server-Side Request Forgery in Website Preview Feature in github.com/lin-snow/ech0

Ech0 has Unauthenticated Server-Side Request Forgery in Website Preview Feature in github.com/lin-snow/ech0

Record
GO-2026-5704
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/lin-snow/ech0
Go
 before 1.4.8-0.20260401031029-4ca56fea5ba4
1.4.8-0.20260401031029-4ca56fea5ba4
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-35036 is a high vulnerability (CVSS 7.5) in Ech0, published April 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 26th percentile. Fixed in github.com/lin-snow/ech0 1.4.8-0.20260401031029-4ca56fea5ba4.

References

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