# CVE-2026-116827: YesWiki before 4.7.0 SSRF via copyUrlToLocalFile in Bazar CSV Import

Status: published. Published: 2026-10-26. Updated: 2026-11-03.

YesWiki before 4.7.0 contains a server-side request forgery vulnerability in the Bazar CSV import copyUrlToLocalFile() function that allows authenticated administrators to make arbitrary outbound requests by supplying crafted URLs in CSV file or image fields. Attackers can bypass the extension check with a query-string suffix or redirects to fetch cloud metadata credentials, internal services, or local files via file://, with responses stored in the web-accessible files/ directory.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- YesWiki / yeswiki: ≥ 0; < 4.7.0 (affected, semver); 4.7.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.2 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.8 (medium); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N; source: CNA: VulnCheck

- CVSS 4.0: 8.2 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/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: 6.8 (medium); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.34% as of 2026-11-03; percentile 28.08%

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

- Weaknesses: CWE-918

## Exploit evidence

- exploit: https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v38g-qc7g-q3mq (ADP: CISA-ADP)

## References

- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v38g-qc7g-q3mq (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-ssrf-via-copyurltolocalfile-in-bazar-csv-import (CNA: VulnCheck; third-party-advisory)

- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v38g-qc7g-q3mq (ADP: CISA-ADP; exploit)

- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v38g-qc7g-q3mq (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/yeswiki-before-4.7.0-ssrf-via-copyurltolocalfile-in-bazar-csv-import (disclosure@vulncheck.com)

- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-v38g-qc7g-q3mq (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-116827; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-116827; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116827; retrieved 2026-11-03; source updated Not reported

Revision: 559d359fab9127458fe5944ddad7d1113ddcf9e457fe1bcaf91c1d44f532df59

Canonical: https://y2.dev/cve/CVE-2026-116827

## 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.