{"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":"2026-07-22T18:55:07.732Z"},"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 — 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 — 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 — 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 com.unblu.contentsecuritypolicy.mode=on. The CSP blocks the injected JavaScript from executing and prevents the exploit from succeeding. Note: this protection is only effective on Unblu Spark 7.56.2 or later in the 7.x series and 8.19.1 or later in the 8.x series, where unsafe-inline was removed from the script source policy. Earlier versions ship a CSP that still permits unsafe-inline and are not protected by this workaround.\n  *  Configure a WAF rule to block requests that carry a malicious payload in the redirectOnFailure parameter (in particular, values containing a javascript: scheme or obfuscated variants such as java%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"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-22T18:54:56.321413Z","id":"CVE-2026-8152","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-22T18:55:07.732Z"}}]}}