Vulnerability-Lookup

GHSA-89F7-R7X8-83Q7

Vulnerability from github – Published: 2026-03-27 15:30 – Updated: 2026-03-27 15:30

Details

The '/api/v1/files/images/{flow_id}/{file_name}' endpoint serves SVG files with the 'image/svg+xml' content type without sanitizing their content.

Since SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary JavaScript when viewed by other users, leading to stored cross-site scripting (XSS). This allows stealing authentication tokens stored in cookies, including JWT access and refresh tokens.

Severity ?

7.0 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-5026"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-27T15:17:04Z",
    "severity": "HIGH"
  },
  "details": "The \u0027/api/v1/files/images/{flow_id}/{file_name}\u0027 endpoint serves SVG files with the \u0027image/svg+xml\u0027 content type without sanitizing their content.\n\nSince SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary JavaScript when viewed by other users, leading to stored cross-site scripting (XSS). This allows stealing authentication tokens stored in cookies, including JWT access and refresh tokens.",
  "id": "GHSA-89f7-r7x8-83q7",
  "modified": "2026-03-27T15:30:26Z",
  "published": "2026-03-27T15:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5026"
    },
    {
      "type": "WEB",
      "url": "https://www.tenable.com/security/research/tra-2026-25"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/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"
    }
  ]
}

CVE-2026-5026 (GCVE-0-2026-5026)

Vulnerability from cvelistv5 – Published: 2026-03-27 14:50 – Updated: 2026-03-27 15:35

Title

Langflow - Stored XSS via Malicious SVG Upload

Summary

The '/api/v1/files/images/{flow_id}/{file_name}' endpoint serves SVG files with the 'image/svg+xml' content type without sanitizing their content. Since SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary JavaScript when viewed by other users, leading to stored cross-site scripting (XSS). This allows stealing authentication tokens stored in cookies, including JWT access and refresh tokens.

Severity ?

7 (High)


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

CWE

CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')

Assigner

tenable

References

URL

Tags

https://www.tenable.com/security/research/tra-2026-25

Impacted products

	Vendor	Product	Version
	langflow-ai	langflow	Affected: 0 (custom)

Date Public ?

2026-03-27 16:00

Show details on NVD website

JSON

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5026",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-27T15:34:45.673719Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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          ],
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        }
      ],
      "metrics": [
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            "privilegesRequired": "LOW",
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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            "valueDensity": "NOT_DEFINED",
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            "vulnAvailabilityImpact": "NONE",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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          "url": "https://www.tenable.com/security/research/tra-2026-25"
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      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Langflow - Stored XSS via Malicious SVG Upload",
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    "datePublished": "2026-03-27T14:50:36.603Z",
    "dateReserved": "2026-03-27T14:43:36.423Z",
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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-89F7-R7X8-83Q7

CVE-2026-5026 (GCVE-0-2026-5026)

Tags

Sightings

Nomenclature