Vulnerability-Lookup

PYSEC-2025-78

Vulnerability from pysec - Published: 2025-12-05 23:15 - Updated: 2026-01-16 21:17

Details

Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.

Severity ?

8.8 (High)


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

Impacted products

Name	purl
langflow	pkg:pypi/langflow

Aliases

CVE-2025-34291

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "langflow",
        "purl": "pkg:pypi/langflow"
      }
    }
  ],
  "aliases": [
    "CVE-2025-34291"
  ],
  "details": "Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins=\u0027*\u0027 with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints \u2014 including built-in code-execution functionality \u2014 allowing the attacker to execute arbitrary code and achieve full system compromise.",
  "id": "PYSEC-2025-78",
  "modified": "2026-01-16T21:17:02.097Z",
  "published": "2025-12-05T23:15:47.433Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/langflow-ai/langflow"
    },
    {
      "type": "EVIDENCE",
      "url": "https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-34291 (GCVE-0-2025-34291)

Vulnerability from cvelistv5 – Published: 2025-12-05 22:27 – Updated: 2026-03-05 12:03

Title

Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE

Summary

Severity ?

9.4 (Critical)


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

CWE

CWE-346 - Origin Validation Error

Assigner

VulnCheck

References

3 references

URL	Tags
https://www.obsidiansecurity.com/blog/cve-2025-34…	technical-descriptionexploit
https://github.com/langflow-ai/langflow	product
https://www.vulncheck.com/advisories/langflow-cor…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Langflow	Langflow	Affected: 0 , ≤ 1.6.9 (semver)

Credits

Fenix Qiao (aka 13ph03nix) from Obsidian Security Shuyang Wang from Obsidian Security

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2025-34291",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-12-08T20:46:28.853065Z",
                "version": "2.0.3"
              },
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        "providerMetadata": {
          "dateUpdated": "2025-12-08T20:46:49.653Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "modules": [
            "CORSMiddleware configuration",
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          ],
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          "repo": "https://github.com/langflow-ai/langflow",
          "vendor": "Langflow",
          "versions": [
            {
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            }
          ]
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      ],
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              "cpeMatch": [
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          "type": "finder",
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        },
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      "impacts": [
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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      "problemTypes": [
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      "providerMetadata": {
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      "source": {
        "discovery": "UNKNOWN"
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    "datePublished": "2025-12-05T22:27:26.438Z",
    "dateReserved": "2025-04-15T19:15:22.581Z",
    "dateUpdated": "2026-03-05T12:03:54.368Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

PYSEC-2025-78

CVE-2025-34291 (GCVE-0-2025-34291)

Tags

Sightings

Nomenclature