{"id":"CVE-2019-12830","aliases":["EUVD-2019-4410","GHSA-h3wx-4w3j-grr9"],"status":"published","title":"In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post...","description":"In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.","severity":{"version":"3.0","score":8.7,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00964,"percentile":0.61923,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-79"],"published":"2019-06-15T17:04:50Z","modified":"2026-06-17T02:15:34Z","products":[{"vendor":"mybb","product":"mybb"}],"references":[{"url":"https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/","tags":["x_refsource_MISC","x_transferred","Exploit","Vendor Advisory"]},{"url":"https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-12830"},{"url":"https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release"},{"url":"https://blog.ripstech.com/2019/mybb-stored-xss-to-rce"},{"url":"https://github.com/advisories/GHSA-h3wx-4w3j-grr9"}],"sources":{"cve":[{"id":"CVE-2019-12830","description":"In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.","status":"published","published":"2019-06-15T17:04:50Z","modified":"2024-08-04T23:32:55.48Z","updated_at":"2026-11-02T14:20:24.025419Z"}],"euvd":[{"id":"EUVD-2019-4410","description":"In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.","status":"published","published":"2019-06-15T17:04:50Z","modified":"2024-08-04T23:32:55Z","updated_at":"2026-11-03T02:40:44.884887Z"}],"ghsa":[{"id":"GHSA-h3wx-4w3j-grr9","title":"In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post...","description":"In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.","status":"published","published":"2022-05-24T16:48:06Z","modified":"2024-04-11T21:08:50Z","cvss":[{"version":"3.0","score":8.7,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:57:07.421443Z"}],"nvd":[{"id":"CVE-2019-12830","description":"In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.","status":"published","published":"2019-06-15T18:29:00.22Z","modified":"2026-06-17T02:15:34.683Z","cvss":[{"version":"3.0","score":8.7,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:05:16.285679Z"}]}}