# CVE-2026-13423: Streamit < 4.5.2 - Unauthenticated Remote Code Execution via Arbitrary Function Call

Status: published. Published: 2026-07-29. Updated: 2026-11-05.

The Streamit WordPress theme before 4.5.2 does not perform any authorization or nonce verification on one of its unauthenticated AJAX routes, which invokes an attacker-supplied PHP function with an attacker-supplied argument array, allowing unauthenticated attackers to call arbitrary functions (for example to create an administrator account), leading to privilege escalation and remote code execution.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Unknown / Streamit: ≥ 0; < 4.5.2 (affected, semver). Source: CNA: WPScan

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: ADP: CISA-ADP

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: 0.96% as of 2026-11-04; percentile 61.77%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-94

## Exploit evidence

- exploit: https://wpscan.com/vulnerability/f85c5da1-412f-4079-8c44-708bc78c2b9b/ (CNA: WPScan)

## References

- https://wpscan.com/vulnerability/f85c5da1-412f-4079-8c44-708bc78c2b9b/ (CNA: WPScan; exploit, vdb-entry, technical-description)

- https://wpscan.com/vulnerability/f85c5da1-412f-4079-8c44-708bc78c2b9b/ (contact@wpscan.com)

## Provenance

- CNA: WPScan: https://www.cve.org/CVERecord?id=CVE-2026-13423; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13423; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-13423; retrieved 2026-11-05; source updated Not reported

Revision: 14223532fddbe0f24aa296e4a2350c228a21dc8df0b42861dfc5499fdc8e6e90

Canonical: https://y2.dev/cve/CVE-2026-13423

## 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.