# CVE-2026-117539: darylldoyle svg-sanitizer before 1.0.0 CSS Injection and Remote Reference Bypass

Status: published. Published: 2026-10-27. Updated: 2026-11-02.

darylldoyle svg-sanitizer before 1.0.0 contains CSS injection and remote reference bypass vulnerabilities that allow attackers to embed external resources by uploading crafted SVG files. Attackers can use unsanitized style content, unquoted url() values, or image href attributes to exfiltrate page data, track users, or disclose visitor IP addresses.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- darylldoyle / svg-sanitizer: ≥ 0; < 1.0.0 (affected, semver); 1.0.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.1 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 3.5 (low); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N; source: CNA: VulnCheck

- CVSS 4.0: 5.1 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 3.5 (low); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-02; percentile 7.09%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-79

## Exploit evidence

- exploit: https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-qhmf-972w-m957 (ADP: CISA-ADP)

## References

- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-qhmf-972w-m957 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/darylldoyle-svg-sanitizer-before-1.0.0-css-injection-and-remote-reference-bypass (CNA: VulnCheck; third-party-advisory)

- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-qhmf-972w-m957 (ADP: CISA-ADP; exploit)

- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-qhmf-972w-m957 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/darylldoyle-svg-sanitizer-before-1.0.0-css-injection-and-remote-reference-bypass (disclosure@vulncheck.com)

- https://github.com/darylldoyle/svg-sanitizer/security/advisories/GHSA-qhmf-972w-m957 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-117539; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-117539; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-117539; retrieved 2026-11-02; source updated Not reported

Revision: 8681335c1fa0315ef5d692ffe6d30628ed47e4ea08a8b02dd96bc98a3b49d91a

Canonical: https://y2.dev/cve/CVE-2026-117539

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.