Vulnerability-Lookup

CVE-2026-79670 (GCVE-0-2026-79670)

Vulnerability from cvelistv5 – Published: 2026-08-25 11:33 – Updated: 2026-08-25 17:30

Title

Ech0 before 4.4.3 Stored XSS via SVG Upload

Summary

Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the application origin when accessed by any user, enabling session hijacking and data exfiltration.

Severity

4.8 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

4.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 17:30 UTC

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

VulnCheck mitre root

References

2 references

URL	Tags
https://github.com/lin-snow/Ech0/security/advisor…	vendor-advisory
https://www.vulncheck.com/advisories/ech0-before-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
lin-snow	Ech0	Affected: 0 , < 4.4.3 (semver) Unaffected: 4.4.3 (semver) cpe:2.3:a:ech0:ech0::::::::

Date Public

2026-04-09 00:00

Credits

offset

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-79670

Vulnerability from fkie_nvd - Published: 2026-08-25 12:16 - Updated: 2026-08-25 18:18

Severity

4.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
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          "defaultStatus": "unaffected",
          "packageURL": "pkg:golang/github.com/lin-snow/ech0",
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  "id": "CVE-2026-79670",
  "lastModified": "2026-08-25T18:18:06.300",
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GHSA-MJ42-9VH2-F8V3

Vulnerability from github – Published: 2026-08-25 12:31 – Updated: 2026-08-25 12:31

Details

Severity

4.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

4.8 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-79670"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-25T12:16:35Z",
    "severity": "MODERATE"
  },
  "details": "Ech0 before 4.4.3 contains a stored cross-site scripting vulnerability in the file upload endpoint that validates Content-Type using only client-supplied headers without server-side inspection. Attackers with admin privileges can upload SVG or HTML files containing JavaScript that executes in the application origin when accessed by any user, enabling session hijacking and data exfiltration.",
  "id": "GHSA-mj42-9vh2-f8v3",
  "modified": "2026-08-25T12:31:27Z",
  "published": "2026-08-25T12:31:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lin-snow/Ech0/security/advisories/GHSA-69hx-63pv-f8f4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-79670"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/ech0-before-stored-xss-via-svg-upload"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-79670 (GCVE-0-2026-79670)

FKIE_CVE-2026-79670

GHSA-MJ42-9VH2-F8V3

Tags

Sightings

Nomenclature