CVE-2021-27131

Published: 16 May 2023

** DISPUTED ** Moodle 3.10.1 is vulnerable to persistent/stored cross-site scripting (XSS) due to the improper input sanitization on the "Additional HTML Section" via "Header and Footer" parameter in /admin/settings.php. This vulnerability is leading an attacker to steal admin and all user account cookies by storing the malicious XSS payload in Header and Footer. NOTE: this is disputed by the vendor because the "Additional HTML Section" for "Header and Footer" can only be supplied by an administrator, who is intentionally allowed to enter unsanitized input (e.g., site-specific JavaScript).

Priority

Cvss 3 Severity Score

5.4

Score breakdown

Status

Package	Release	Status
moodle Launchpad, Ubuntu, Debian	bionic	Needed
	focal	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	noble	Does not exist
	trusty	Ignored (end of standard support)
	upstream	Needs triage
	xenial	Needed

Severity score breakdown

Parameter	Value
Base score	5.4
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	Required
Scope	Changed
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

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