CVE-2026-33975Public exploitNetwork attack vector

Authenticated SSRF via IPv4-mapped IPv6 normalization

Published May 5, 2026 · Updated May 5, 2026

SSRF in Twenty 1.18.0 and earlier allows remote authenticated users to access internal services through crafted IPv6 URL literals. The isPrivateIp utility checks only dotted-decimal IPv4-mapped forms after Node.js converts URL literals to hex, and IP literals skip lookup validation. Access to the AI agent is required; default safe mode remains exposed, allowing internal-service access and cloud-credential disclosure.

CVSS severity8.3
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Twenty 1.18.0 and earlier allows remote authenticated users to access internal services through crafted IPv6 URL literals. The isPrivateIp utility checks only dotted-decimal IPv4-mapped forms after Node.js converts URL literals to hex, and IP literals skip lookup validation. Access to the AI agent is required; default safe mode remains exposed, allowing internal-service access and cloud-credential disclosure.

The record

CVE
CVE-2026-33975
Published
May 5, 2026
Updated
May 5, 2026
Vendor
Twenty
Product
Twenty
Classifications
CWE-918, T1552.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 1.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Twenty · Twentyversion=<= 1.18.0

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
8.3GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1552.005Cloud Instance Metadata API

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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