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Servers and applications

CVE-2018-1000813

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
Medium 4.8
Published
20 Dec 2018
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
0.7% in the next 30 daysHigher than 54% of CVEs. EPSS by FIRST, 10 Nov 2026
Weakness
Cross-site scripting (CWE-79)
Attack
Over the network · Needs an administrator account · Needs someone to click or open something
Attacker can
Read some data · Change some data
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Sources
NVD

Affected software

SoftwareAffected versions
Backdrop CMSServers and applications · cpe:a:backdropcms:backdrop_cms
  • Every version up to 1.11.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-1000813
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-1000813