CVE-2021-29267

MEDIUM

Sherlock SherlockIM < 2021-03-29 - Cross-Site Scripting via Chatbot Attachment URI

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-29267. PoCs published by Security-AVS.

AI-analyzed exploit summary The repository describes a persistent XSS vulnerability in SherlockIM ChatBot (CVE-2021-29267), where an attacker can upload a malicious HTML file via the chat bot, which then executes in the context of a customer's subdomain. The writeup includes attack vectors, vendor details, and a proof-of-concept image but lacks functional exploit code.

Description

Sherlock SherlockIM through 2021-03-29 allows Cross Site Scripting (XSS) by leveraging the api/Files/Attachment URI to attack help-desk staff via the chatbot feature.

Exploits (1)

nomisec WRITEUP 1 stars
by Security-AVS · poc
https://github.com/Security-AVS/CVE-2021-29267

The repository describes a persistent XSS vulnerability in SherlockIM ChatBot (CVE-2021-29267), where an attacker can upload a malicious HTML file via the chat bot, which then executes in the context of a customer's subdomain. The writeup includes attack vectors, vendor details, and a proof-of-concept image but lacks functional exploit code.

Classification
Writeup 90%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: SherlockIM ChatBot
No auth needed
Prerequisites: Access to the SherlockIM ChatBot interface to upload a malicious HTML file
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (2)

Core 2
Core References
Product x_refsource_misc
https://sherlockim.ae
Exploit, Third Party Advisory x_refsource_misc
https://github.com/Security-AVS/CVE-2021-29267

Scores

CVSS v3 6.1
EPSS 0.0085
EPSS Percentile 53.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
sherlockim/sherlockim < 2021-03-29
Published Mar 29, 2021
Tracked Since Feb 18, 2026