{"id":"CVE-2026-8981","aliases":["EUVD-2026-35352","GHSA-cfcv-65jq-76jw"],"status":"published","title":"Lazy Blocks \u003c 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.","severity":{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","level":"low","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00138,"percentile":0.03245,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2026-06-09T06:00:09Z","modified":"2026-07-23T08:10:00Z","products":[{"vendor":"unknown","product":"custom block builder"}],"references":[{"url":"https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/","tags":["exploit","vdb-entry","technical-description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8981"},{"url":"https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698"},{"url":"https://github.com/advisories/GHSA-cfcv-65jq-76jw"}],"sources":{"cve":[{"id":"CVE-2026-8981","title":"Lazy Blocks \u003c 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.","status":"published","published":"2026-06-09T06:00:09.486Z","modified":"2026-06-09T10:32:50.766Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","level":"low","assessor":"adp"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T13:48:13.398044Z"}],"euvd":[{"id":"EUVD-2026-35352","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.","status":"published","published":"2026-06-09T06:00:09Z","modified":"2026-06-09T10:32:50Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T18:20:48.012898Z"}],"ghsa":[{"id":"GHSA-cfcv-65jq-76jw","title":"The Custom Block Builder  WordPress plugin before 4.3.0 does not consistently check the...","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.","status":"published","published":"2026-06-09T06:31:59Z","modified":"2026-06-09T12:33:10Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","level":"low"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T15:08:40.95868Z"}],"nvd":[{"id":"CVE-2026-8981","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.","status":"published","published":"2026-06-09T06:16:54.067Z","modified":"2026-07-23T08:10:00.137Z","cvss":[{"version":"3.1","score":3.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:12:22.73178Z"}]}}