CVE-2021-45268

HIGH

Backdrop CMS 1.20 - Cross-Site Request Forgery to Remote Code Execution via Malicious Add-on Upload

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-45268. PoCs published by V1n1v131r4.

AI-analyzed exploit summary This exploit demonstrates a CSRF vulnerability in Backdrop CMS 1.20.0, allowing an attacker to create an admin user and achieve RCE by uploading a malicious add-on. The PoC includes crafted HTML forms with session tokens and form IDs to bypass CSRF protections.

Description

A Cross Site Request Forgery (CSRF) vulnerability exists in Backdrop CMS 1.20, which allows Remote Attackers to gain Remote Code Execution (RCE) on the Hosting Webserver via uploading a maliciously add-on with crafted PHP file. NOTE: the vendor disputes this because the attack requires a session cookie of a high-privileged authenticated user who is entitled to install arbitrary add-ons

Exploits (1)

exploitdb WORKING POC
by V1n1v131r4 · htmlwebappsphp
https://www.exploit-db.com/exploits/50323

This exploit demonstrates a CSRF vulnerability in Backdrop CMS 1.20.0, allowing an attacker to create an admin user and achieve RCE by uploading a malicious add-on. The PoC includes crafted HTML forms with session tokens and form IDs to bypass CSRF protections.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Backdrop CMS 1.20.0
No auth needed
Prerequisites: Victim must be logged into Backdrop CMS as an admin · Attacker must trick victim into visiting a malicious page
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (2)

Core 2
Core References
Third Party Advisory, VDB Entry x_refsource_misc
https://www.exploit-db.com/exploits/50323

Scores

CVSS v3 8.8
EPSS 0.0045
EPSS Percentile 64.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-352
Status published
Products (1)
backdropcms/backdrop 1.20.0
Published Feb 03, 2022
Tracked Since Feb 18, 2026