CVE-2026-33975: high-severity vulnerability in twentyhq twenty
twenty-server SSRF protection bypass via IPv4-mapped IPv6 address normalization
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.3epss 0.2%
Twenty is an open source CRM built with NestJS (Node.js). In versions 1.18.0 and earlier, the SSRF protection in twenty-server's SecureHttpClientService can be bypassed using IPv4-mapped IPv6 addresses in URL IP literals. Node.js's URL parser normalizes IPv4-mapped IPv6 addresses to compressed hex form (e.g., ::ffff:169.254.169.254 becomes ::ffff:a9fe:a9fe), but the isPrivateIp utility only recognizes the dotted-decimal notation. As a result, the hex form passes the SSRF check unchecked. Additionally, the socket lookup validation event does not fire for IP literal addresses, bypassing the second validation layer. An authenticated user can reach any internal IP, including cloud metadata endpoints, to exfiltrate credentials such as IAM keys.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Affected products
twentyhq · twentyRelated CVEs — twentyhq twenty
In the same product, most dangerous first.
CVE-2026-73069CRITICALTwenty: SQL Injection in the `searchVector` Field Settings Allows Arbitrary PostgreSQL ExecutionEPSS 0.7%CVE-2026-46624CRITICALTwenty: SQL Injection via the timeZone fieldEPSS 0.5%CVE-2026-92771HIGHTwenty before 2.35.0 Permission Bypass via groupBy-with-records QueryEPSS 0.4%CVE-2026-85055HIGHTwenty: Field-level read bypassEPSS 0.4%CVE-2026-82274MEDIUMTwenty Open Redirect via OAuth Propagator CallbackEPSS 0.4%CVE-2026-35451MEDIUMTwenty: Stored XSS via BlockNote FileBlockEPSS 0.3%