CVE-2023-24539

Improper sanitization of CSS values in html/template

Severity Score

7.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

Angle brackets (<>) are not considered dangerous characters when inserted into CSS contexts. Templates containing multiple actions separated by a '/' character can result in unexpectedly closing the CSS context and allowing for injection of unexpected HTML, if executed with untrusted input.

A flaw was found in golang where angle brackets (<>) were not considered dangerous characters when inserted into CSS contexts. Templates containing multiple actions separated by a '/' character could result in the CSS context unexpectedly closing, allowing for the injection of unexpected HMTL if executed with untrusted input.

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*Credits: Juho Nurminen of Mattermost

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-01-25 CVE Reserved
2023-05-11 CVE Published
2025-01-24 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-94: Improper Control of Generation of Code ('Code Injection')
CWE-176: Improper Handling of Unicode Encoding

CAPEC

References (6)

URL	Tag	Source
https://groups.google.com/g/golang-announce/c/MEb0UyuSMsU	Mailing List

URL	Date	SRC

URL	Date	SRC
https://go.dev/cl/491615	2023-11-07
https://go.dev/issue/59720	2023-11-07

URL	Date	SRC
https://pkg.go.dev/vuln/GO-2023-1751	2023-11-07
https://access.redhat.com/security/cve/CVE-2023-24539	2024-05-21
https://bugzilla.redhat.com/show_bug.cgi?id=2196026	2024-05-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Golang Search vendor "Golang"		Go Search vendor "Golang" for product "Go"				< 1.19.9 Search vendor "Golang" for product "Go" and version " < 1.19.9"		-		Affected
Golang Search vendor "Golang"		Go Search vendor "Golang" for product "Go"				>= 1.20.0 < 1.20.4 Search vendor "Golang" for product "Go" and version " >= 1.20.0 < 1.20.4"		-		Affected