CVE-2018-1000813

4.8 mediumEPSS 0.7%

Medium (4.8) in backdropcms backdrop cms. EPSS 0.7% chance of exploitation in the next 30 days.

Backdrop CMS version 1.11.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in Sanitization of custom class names used on blocks and layouts. that can result in Execution of JavaScript from an unexpected source.. This attack appear to be exploitable via A user must be directed to an affected page while logged in.. This vulnerability appears to have been fixed in 1.11.1 and later.

Severity

CVSS 3.0

4.8 medium

CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 54% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2018-12-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

backdropcms:backdrop_cms

References

https://backdropcms.org/security/backdrop-sa-core-2018-005
https://backdropcms.org/security/backdrop-sa-core-2018-005

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