CVE‑2026‑62863 - MoLing：未授權 SSE 與萬用 CORS 造成工具會話外洩
CVE-2026-62863 - MoLing: unauthenticated SSE and wildcard CORS expose tool sessions
MoLing 0.5.0 之前的 SSE 模式未授權，攻擊者可透過瀏覽器讀取 sessionId，進而傳送未授權的 MCP 工具呼叫。
\n- 影響範圍：任何使用 -l 啟用 SSE 的 MoLing 0.4.x 及以下版本。
此漏洞允許攻擊者透過瀏覽器取得未授權的工具呼叫許可權，提示使用者盡速升級至 0.5.0 以消除風險，並確保 SSE 模式不再對外開放。
MoLing is a computer-use and browser-use based MCP server. Prior to 0.5.0, when MoLing runs in SSE mode using `-l`, its `/sse` and `/message` HTTP endpoints do not authenticate requests and the `mcp-go` dependency sets `Access-Control-Allow-Origin: *`. A malicious web page can open a cross-origin `EventSource` to `/sse`, including a loopback listener, and read the `endpoint` event to obtain `sessionId`. After a victim running SSE mode visits that page, the attacker can use the disclosed `sessionId` against `/message` to send unauthorized MCP tool calls. Depending on the configured tools, those calls can read or write local files, execute commands or perform other actions. Binding only to loopback does not prevent this browser-mediated attack. This issue is fixed in version 0.5.0.
Impact
Affected Products
The following products are affected by CVE-2026-62863
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Update MoLing to version 0.5.0 to fix insecure HTTP endpoints.
- Update MoLing to version 0.5.0 or later.
- Ensure SSE mode is not used with `-l` flag.
- Restrict `Access-Control-Allow-Origin` header.
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-62863.
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-62863 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-62863
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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CVE-2026-62863 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-62863 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
十月. 30, 2026
Action Type Old Value New Value Added Description MoLing is a computer-use and browser-use based MCP server. Prior to 0.5.0, when MoLing runs in SSE mode using `-l`, its `/sse` and `/message` HTTP endpoints do not authenticate requests and the `mcp-go` dependency sets `Access-Control-Allow-Origin: *`. A malicious web page can open a cross-origin `EventSource` to `/sse`, including a loopback listener, and read the `endpoint` event to obtain `sessionId`. After a victim running SSE mode visits that page, the attacker can use the disclosed `sessionId` against `/message` to send unauthorized MCP tool calls. Depending on the configured tools, those calls can read or write local files, execute commands or perform other actions. Binding only to loopback does not prevent this browser-mediated attack. This issue is fixed in version 0.5.0. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L Added CWE CWE-306 Added CWE CWE-942 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/62xxx/CVE-2026-62863.json">CVE-2026-62863</a> Added Reference https://github.com/gojue/moling/commit/ae07f704cbc88d4419fc0fbaec278090fcd0502d Added Reference https://github.com/gojue/moling/pull/48 Added Reference https://github.com/gojue/moling/releases/tag/v0.5.0 Added Reference https://github.com/gojue/moling/security/advisories/GHSA-qpgh-hp5g-4vwp
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.