October Rain has Stored XSS via SVG Filter Bypass
Published Apr 14, 2026 · Updated Oct 23, 2026 · Also known as GHSA-gcqv-f29m-67gr
Original summary
Normalized public record · Updated Oct 23, 2026
October Rain has Stored XSS via SVG Filter Bypass
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
A stored cross-site scripting (XSS) vulnerability was identified in the SVG sanitization logic. The regex pattern used to strip `on*` event handler attributes could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries.
Potential impact
- Stored XSS via malicious SVG files uploaded through the Media Manager - Could allow privilege escalation if a superuser views or embeds the malicious SVG - Requires authenticated backend access with media upload permissions (media.library.create) - SVG must be viewed or embedded in a page to trigger
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- GHSA-gcqv-f29m-67gr
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Apr 14, 2026 · Last refreshed Oct 23, 2026