{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-8152", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "state": "PUBLISHED", "assignerShortName": "NCSC.ch", "dateReserved": "2026-05-08T08:12:13.325Z", "datePublished": "2026-07-22T12:21:28.977Z", "dateUpdated": "2026-07-22T12:21:28.977Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2026-07-22T12:21:28.977Z"}, "title": "Unblu Spark Open Redirect leading to DOM-Based XSS", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-601", "description": "CWE-601 URL Redirection to Untrusted Site ('Open Redirect')", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-79", "description": "CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-588", "descriptions": [{"lang": "en", "value": "CAPEC-588 \u2014 DOM-Based XSS"}]}], "affected": [{"vendor": "Unblu inc.", "product": "Unblu Spark", "platforms": ["On-premises", "Cloud"], "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "8.36.1", "versionType": "semver"}, {"status": "unaffected", "version": "8.36.1-hotfix.0", "versionType": "semver"}, {"status": "unaffected", "version": "8.37.0", "versionType": "semver"}], "defaultStatus": "affected"}], "descriptions": [{"lang": "en", "value": "Unblu Spark contains an open redirect vulnerability that can be escalated to a DOM-based cross-site scripting (XSS) attack.\n\n\nWhen Unblu Spark is deployed with com.unblu.identifier.siteEmbeddedSetup=true, it runs in the same origin as the host application. Any JavaScript injected through this vulnerability therefore executes with full access to the host application's cookies, DOM, and same-origin APIs \u2014 an attacker can reach all resources of the host application, not just Unblu's. This expanded blast radius is the reason on-premises deployments using this configuration are rated CRITICAL.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div><div>Unblu Spark contains an open redirect vulnerability that can be escalated to a DOM-based cross-site scripting (XSS) attack.</div><br><div>When Unblu Spark is deployed with <code>com.unblu.identifier.siteEmbeddedSetup=true</code>, it runs in the same origin as the host application. Any JavaScript injected through this vulnerability therefore executes with full access to the host application's cookies, DOM, and same-origin APIs \u2014 an attacker can reach all resources of the host application, not just Unblu's. This expanded blast radius is the reason on-premises deployments using this configuration are rated CRITICAL.</div></div><p><br></p>"}]}], "references": [{"url": "https://docs.unblu.com/latest/security-bulletins/#UBL-2026-001", "name": "Unblu Security Advisories", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "On-premises deployment (same site)"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 9.3, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "Cloud deployment"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"}}], "workarounds": [{"lang": "en", "value": "If you cannot upgrade immediately, either of the following measures prevents exploitation:\n\n * Enable the built-in Content Security Policy by setting\u00a0com.unblu.contentsecuritypolicy.mode=on. The CSP blocks the injected JavaScript from executing and prevents the exploit from succeeding. Note:\u00a0this protection is only effective on Unblu Spark 7.56.2 or later\u00a0in the 7.x series and 8.19.1 or later\u00a0in the 8.x series, where\u00a0unsafe-inline\u00a0was removed from the script source policy. Earlier versions ship a CSP that still permits\u00a0unsafe-inline\u00a0and are not protected by this workaround.\n * Configure a WAF rule to block requests that carry a malicious payload in the\u00a0redirectOnFailure\u00a0parameter (in particular, values containing a\u00a0javascript:\u00a0scheme or obfuscated variants such as\u00a0java%0ascript:).", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>If you cannot upgrade immediately, either of the following measures prevents exploitation:</div><div><ul><li>Enable the built-in Content Security Policy by setting&nbsp;<code>com.unblu.contentsecuritypolicy.mode=on</code>. The CSP blocks the injected JavaScript from executing and prevents the exploit from succeeding. <b>Note:</b>&nbsp;this protection is only effective on Unblu Spark <b>7.56.2 or later</b>&nbsp;in the 7.x series and <b>8.19.1 or later</b>&nbsp;in the 8.x series, where&nbsp;<code>unsafe-inline</code>&nbsp;was removed from the script source policy. Earlier versions ship a CSP that still permits&nbsp;<code>unsafe-inline</code>&nbsp;and are not protected by this workaround.</li><li>Configure a WAF rule to block requests that carry a malicious payload in the&nbsp;<code>redirectOnFailure</code>&nbsp;parameter (in particular, values containing a&nbsp;<code>javascript:</code>&nbsp;scheme or obfuscated variants such as&nbsp;<code>java%0ascript:</code>).</li></ul></div><br><br>"}]}], "solutions": [{"lang": "en", "value": "In the fix versions listed above, Unblu Spark validates all user-supplied redirects through the same redirect filter.\n\n\nAfter upgrading, please review your redirect filter configuration. The defaults restrict redirects to the current origin (document.location.origin).", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>In the fix versions listed above, Unblu Spark validates all user-supplied redirects through the same redirect filter.</div><br><div>After upgrading, please review your redirect filter configuration. The defaults restrict redirects to the current origin (<code>document.location.origin</code>).</div><div><br></div><br>"}]}], "credits": [{"lang": "en", "value": "Kenan Karalioglu (chef_shell) via YesWeHack", "type": "finder"}], "source": {"advisory": "UBL-2026-001", "discovery": "EXTERNAL"}, "x_generator": {"engine": "manual"}}}}

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