Critical Injection exploit reference

CVE-2025-55733 — DeepChat One-click Remote Code Execution through Custom URL Handling

DeepChat is a smart assistant that connects powerful AI to your personal world. DeepChat before 0.3.1 has a one-click remote code execution vulnerability. An attacker can exploit this vulnerability by embedding a specially crafted deepchat: URL on any website, including a malicious one they control. When a victim visits such a site or clicks on the link, the browser triggers the app’s custom URL handler (deepchat:), causing the DeepChat application to launch and process the URL, leading to remote code execution on the victim’s machine. This vulnerability is fixed in 0.3.1.

Published Aug 19, 2025 · Updated Oct 26, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: GitHub_M

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.7% (30-day exploitation probability)+8
Technical severity (critical)+10
CISA SSVC: exploitation "poc"+5

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.68%

ahead of 52% of scored CVEs · Oct 29, 2026

Affects

Thinkinai

Deepchat

CVSS base

9.6

Critical · 2 source(s)

Prioritization reference: 9.7 provisional

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Proof of concept

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — github.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Thinkinai Deepchat, ThinkInAIXYZ Deepchat).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Thinkinai	Deepchat	version 0.3.0	Vulnerable	NIST National Vulnerability Database
ThinkInAIXYZ	Deepchat	version < 0.3.1	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
9.7	CVSS 3.1	Critical	—	—	GitHub_M via CVE Program (cve.org) e CISA ADP
9.6	CVSS 3.1	Critical	2.8	6.0	security-advisories@github.com via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H (score shown at the top: security-advisories@github.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-94 · Code Injection

Other CVEs with this weakness →

EPSS over time FIRST

Oct 26, 2026 → Oct 29, 2026 · 4 reading(s) · max 0.68%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Look for parameters with command/query metacharacters and unexpected child processes of the service.

web/proxy/WAF logsnetwork IDS/IPSapplication logsendpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · thinkinaixyz/deepchat
Oct 26, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 26, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 26, 2026
Fix documented
Oct 26, 2026 · NIST National Vulnerability Database
Affected products added · thinkinai/deepchat
Oct 26, 2026 · NIST National Vulnerability Database
CVSS changed · 9.6
Oct 26, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 26, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 26, 2026 · Alertas do Telegram
2025
CVE published
Aug 19, 2025 · GitHub_M

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 26, 2026 – Oct 26, 2026
1× Official description updated · Oct 26, 2026 – Oct 26, 2026

References

2 on the record

github.com/ThinkInAIXYZ/deepchat/security/advisories/GHSA-hqr4-4gfc-5p2j
Exploit, Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
github.com/ThinkInAIXYZ/deepchat/commit/a0ff6f362e01ddceb7fd42d0af0b28b6184fb4d2
Patch, x_refsource_MISC, NIST National Vulnerability Database

Elsewhere on this site

Thinkinai
every CVE for this vendor

Injection
same class

CWE-94
other pages naming this weakness

Related CVEs (same products)

Critical CVE-2026-43899 DeepChat: Electron Pop-up Handler Bypass Enables Arbitrary Protocol Execution May 11, 2026
Critical CVE-2026-43900 DeepChat SVG Artifact XSS via Sanitizer Bypass (CVE-2026-43900) May 11, 2026
Critical CVE-2025-67744 Mermaid XSS vulnerability leads to Remote Code Execution Dec 15, 2025
Critical CVE-2025-66481 DeepChat's Incomplete XSS Fix Allows RCE through Mermaid Content Dec 8, 2025
Critical CVE-2025-66222 DeepChat Cross-Site Scripting(XSS) escalate to Remote Code Execution(RCE) Dec 3, 2025

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-55733 is "DeepChat One-click Remote Code Execution through Custom URL Handling", rated Critical. It affects Deepchat (Thinkinai); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.6 describes technical severity. EPSS 0.68% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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