# CVE-2026-129259: Mereithhh VanBlog Image Upload Endpoint access.ts cross site scripting

Status: published. Published: 2026-11-14. Updated: 2026-11-14.

A weakness has been identified in Mereithhh VanBlog up to 0.54.0. This affects an unknown part of the file packages/server/src/types/access/access.ts of the component Image Upload Endpoint. Executing a manipulation can lead to cross site scripting. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Mereithhh / VanBlog: 0.1 (affected); 0.2 (affected); 0.3 (affected); 0.4 (affected); 0.5 (affected); 0.6 (affected); 0.7 (affected); 0.8 (affected); 0.9 (affected); 0.10 (affected); 0.11 (affected); 0.12 (affected); 0.13 (affected); 0.14 (affected); 0.15 (affected); 0.16 (affected); 0.17 (affected); 0.18 (affected); 0.19 (affected); 0.20 (affected); 0.21 (affected); 0.22 (affected); 0.23 (affected); 0.24 (affected); 0.25 (affected); 0.26 (affected); 0.27 (affected); 0.28 (affected); 0.29 (affected); 0.30 (affected); 0.31 (affected); 0.32 (affected); 0.33 (affected); 0.34 (affected); 0.35 (affected); 0.36 (affected); 0.37 (affected); 0.38 (affected); 0.39 (affected); 0.40 (affected); 0.41 (affected); 0.42 (affected); 0.43 (affected); 0.44 (affected); 0.45 (affected); 0.46 (affected); 0.47 (affected); 0.48 (affected); 0.49 (affected); 0.50 (affected); 0.51 (affected); 0.52 (affected); 0.53 (affected); 0.54.0 (affected). Source: CNA: VulDB

## Severity and prioritization

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

- CVSS 3.1: 3.5 (low); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 3.0: 3.5 (low); CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 2.0: 4 (medium); AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:C; source: CNA: VulDB

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79, CWE-94

## Exploit evidence

- exploit: http://note.geronimo.xin/post/70 (CNA: VulDB)

## References

- https://vuldb.com/vuln/437297 (CNA: VulDB; vdb-entry)

- https://vuldb.com/vuln/437297/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-129259 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/1043136 (CNA: VulDB; third-party-advisory)

- http://note.geronimo.xin/post/70 (CNA: VulDB; exploit)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-129259; retrieved 2026-11-14; source updated 2026-11-14

Revision: 8298d345da2109e3da90cb9f1d193c8bc9be55bfc3faf342ec7b936b2641548a

Canonical: https://y2.dev/cve/CVE-2026-129259

## Agent and API access

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- 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.