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Vulnerability record · CVE-2021-45268 · published 3 February 2022

CVE-2021-45268: Backdropcms backdrop cross-site request forgery vulnerability

Backdropcms · Backdrop

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

8.8 CVSS 3.1 High EPSS 1.8% · top 22.1% CWE-352 · Cross-site request forgery
8.8CVSS 3.1 base score, v2 6.8
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/V1n1v131r4/CSRF-to-RCE-on-Backdrop-CMS ExploitThird Party Advisory
https://www.exploit-db.com/exploits/50323 Third Party AdvisoryVDB Entry
https://github.com/V1n1v131r4/CSRF-to-RCE-on-Backdrop-CMS ExploitThird Party Advisory
https://www.exploit-db.com/exploits/50323 Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-45268), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.