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SVG Injection via Unsanitized Options in @dicebear/core and @dicebear/initials

Moderate severity GitHub Reviewed Published Mar 18, 2026 in dicebear/dicebear • Updated Mar 25, 2026

Package

npm @dicebear/core (npm)

Affected versions

>= 5.0.0, <= 5.4.3
>= 6.0.0, <= 6.1.3
>= 7.0.0, <= 7.1.3
>= 8.0.0, <= 8.0.2
>= 9.0.0, <= 9.4.0

Patched versions

5.4.4
6.1.4
7.1.4
8.0.3
9.4.1
npm @dicebear/initials (npm)
>= 5.0.0, <= 5.4.3
>= 6.0.0, <= 6.1.3
>= 7.0.0, <= 7.1.3
>= 8.0.0, <= 8.0.2
>= 9.0.0, <= 9.4.0
5.4.4
6.1.4
7.1.4
8.0.3
9.4.1

Description

Summary

SVG attribute values derived from user-supplied options (backgroundColor, fontFamily, textColor) were not XML-escaped before interpolation into SVG output. This could allow Cross-Site Scripting (XSS) when applications pass untrusted input to createAvatar() and serve the resulting SVG inline or with Content-Type: image/svg+xml.

Affected packages

  • @dicebear/core — backgroundColor option values interpolated into SVG attributes without escaping (affects solid and gradientLinear background types)
  • @dicebear/initials — fontFamily and textColor option values interpolated into SVG attributes without escaping

Fix

All affected SVG attribute values are now properly escaped using XML entity encoding. Users should upgrade to the listed patched versions.

Mitigating factors

  • Applications that validate input against the library's JSON Schema before passing it to createAvatar() are not affected
  • The DiceBear CLI validates input via AJV and was not vulnerable
  • Exploitation requires that an application passes untrusted, unvalidated external input directly as option values

References

@FlorianKoerner FlorianKoerner published to dicebear/dicebear Mar 18, 2026
Published to the GitHub Advisory Database Mar 19, 2026
Reviewed Mar 19, 2026
Published by the National Vulnerability Database Mar 24, 2026
Last updated Mar 25, 2026

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
High
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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:N/UI:R/S:C/C:L/I:L/A:N

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.
(9th 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-2026-33311

GHSA ID

GHSA-mr9r-mww3-v6gv

Source code

Credits

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