CVE-2021-45268

8.8 highEPSS 1.8%

High (8.8) in backdropcms backdrop. EPSS 1.8% chance of exploitation in the next 30 days.

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

Severity

CVSS 3.1

8.8 high

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

EPSS: 1.8% chance of exploitation in the next 30 days; higher than 78% of CVEs (scores of 2026-10-31)
CWE: CWE-352
Published: 2022-02-03
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

backdropcms:backdrop

References

https://github.com/V1n1v131r4/CSRF-to-RCE-on-Backdrop-CMS
https://www.exploit-db.com/exploits/50323
https://github.com/V1n1v131r4/CSRF-to-RCE-on-Backdrop-CMS
https://www.exploit-db.com/exploits/50323

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