{"id":"CVE-2026-8981","state":"PUBLISHED","title":"Lazy Blocks < 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML","description":"The Custom Block Builder  WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.","publishedAt":"2026-06-09T06:00:09.486Z","updatedAt":"2026-06-09T10:32:50.766Z","severity":{"score":3.5,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","source":"CISA-ADP"},"assigner":"WPScan","products":["Unknown Custom Block Builder"],"affected":[{"vendor":"Unknown","product":"Custom Block Builder","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.3.0","versionType":"semver"}]}],"references":["https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/"],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/8xxx/CVE-2026-8981.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8981","state":"PUBLISHED","datePublished":"2026-06-09T06:00:09.486Z","dateUpdated":"2026-06-09T10:32:50.766Z","assignerShortName":"WPScan","assignerOrgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","dateReserved":"2026-05-19T13:11:53.990Z"},"containers":{"cna":{"title":"Lazy Blocks < 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML","descriptions":[{"lang":"en","value":"The Custom Block Builder  WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block."}],"affected":[{"vendor":"Unknown","product":"Custom Block Builder","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.3.0","versionType":"semver"}]}],"references":[{"url":"https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/","tags":["exploit","vdb-entry","technical-description"]}],"problemTypes":[{"descriptions":[{"description":"CWE-79 Cross-Site Scripting (XSS)","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"WPScan","orgId":"1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81","dateUpdated":"2026-06-09T06:00:09.486Z"},"credits":[{"lang":"en","value":"Luca Jungnickel","type":"finder"},{"lang":"en","value":"WPScan","type":"coordinator"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"WPScan CVE Generator"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":3.5,"attackVector":"NETWORK","baseSeverity":"LOW","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","integrityImpact":"LOW","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"HIGH","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-06-09T10:32:46.274624Z","id":"CVE-2026-8981","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","type":"CWE","lang":"en","description":"CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-09T10:32:50.766Z"}}]}}}