Cross-site scripting in CKEditor library in Backdrop CMS



Published: 2021-05-27 | Updated: 2021-06-15
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-33829
CWE ID CWE-79
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Backdrop CMS
Web applications / CMS

Vendor Backdrop CMS

Security Advisory

This security advisory describes one low risk vulnerability.

1) Cross-site scripting

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-33829

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Backdrop CMS: 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.17.4, 1.17.5, 1.17.6, 1.17.7, 1.18.0, 1.18.1, 1.18.2, 1.18.3, 1.18.4, 1.19.0

CPE External links

https://backdropcms.org/security/backdrop-sa-core-2021-003

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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