Skip to content

CraftCMS stored XSS in Quick Post widget error message

Low severity GitHub Reviewed Published May 25, 2023 in craftcms/cms • Updated Nov 8, 2023

Package

composer craftcms/cms (Composer)

Affected versions

>= 4.0.0-RC1, < 4.4.6
>= 3.0.0, <= 3.8.5

Patched versions

4.4.6
3.8.6

Description

Summary

The platform does not filter input and encode output in Quick Post validation error message, which can deliver an XSS payload.

Details

Old CVE fixed the XSS in label HTML but didn’t fix it when clicking save.

PoC

  1. Login at admin

  2. Go to setting

  3. Create a Section

  4. On Entry page, click Edit label

  5. Inject the XSS payload into the label and save

  6. On the admin dashboard choose new widget -> Quick Post

  7. In Quick Post, click save with blank slug; The XSS will be executed

    "errors":{"title":["<script>alert('nono')</script> cannot be blank."],"slug":["Slug cannot be blank."]

Fixed in craftcms/cms@9d0cd0b

References

@angrybrad angrybrad published to craftcms/cms May 25, 2023
Published to the GitHub Advisory Database May 26, 2023
Reviewed May 26, 2023
Published by the National Vulnerability Database May 26, 2023
Last updated Nov 8, 2023

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:L

EPSS score

0.066%
(31st percentile)

Weaknesses

CVE ID

CVE-2023-33194

GHSA ID

GHSA-3wxg-w96j-8hq9

Source code

Credits

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.