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Withdrawn Advisory: AlchemyCMS is vulnerable to stored XSS via the /admin/pictures image field

Moderate severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Aug 29, 2025
Withdrawn This advisory was withdrawn on Aug 29, 2025

Package

bundler alchemy_cms (RubyGems)

Affected versions

= 4.1.0

Patched versions

None

Description

Withdrawn Advisory

This advisory has been withdrawn because it does not describe a vulnerability. The maintainer states the following:

The researcher used an authorized cookie to perform the request to a password-protected route. Without that session cookie, the request would have been rejected as unauthorized.

Original Description

A Stored XSS vulnerability has been discovered in version 4.1.0 of AlchemyCMS via the /admin/pictures image field.

References

Published by the National Vulnerability Database Oct 16, 2018
Published to the GitHub Advisory Database May 14, 2022
Reviewed Aug 1, 2023
Last updated Aug 29, 2025
Withdrawn Aug 29, 2025

Severity

Moderate

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
Low
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
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:L/PR:H/UI:R/S:C/C:L/I:L/A:L

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(61st percentile)

Weaknesses

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Learn more on MITRE.

CVE ID

CVE-2018-18307

GHSA ID

GHSA-7mj4-2984-955f

Source code

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