What is CVE-2026-43900?

CVE-2026-43900 is a critical-severity vulnerability in Thinkinaixyz Deepchat, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-05-11.

How severe is CVE-2026-43900?

Critical severity. CVSS v3 base score is 9.3 out of 10.

XSS in Thinkinaixyz Deepchat

CVE-2026-43900

DeepChat is an open-source artificial intelligence agent platform that unifies models, tools, and agents. Prior to v1.0.4-beta.1, a Cross-Site Scripting (XSS) vulnerability exists due to a discrepancy between the backend validation layer a…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (13.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Thinkinaixyz Deepchat — versions < 1.0.4-beta.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-43900?: CVE-2026-43900 is a critical-severity vulnerability in Thinkinaixyz Deepchat, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-05-11.
How severe is CVE-2026-43900?: Critical severity. CVSS v3 base score is 9.3 out of 10.