CVE-2026-93866：WatchGuard Fireware OS Access Portal 允許遠端未授權寫入堆疊緩衝區
CVE-2026-93866 - Fireware OS Pre-Authentication Integer Overflow in Access Portal Allows Out-of-Bounds Write
CVE-2026-93866 是一個在 WatchGuard Fireware OS Access Portal 中發現的整數溢位漏洞，允許遠端未授權攻擊者寫入堆疊緩衝區。
此 CVE 允許未授權遠端寫入堆疊緩衝區，需即時升級或停用 Access Portal 以降低風險。
An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.
Impact
Affected Products
The following products are affected by CVE-2026-93866
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.
| ID | Vendor | Product | Action |
|---|---|---|---|
| 1 | Watchguard | fireware_os |
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 4.0 | CRITICAL | 5d1c2695-1a31-4499-88ae-e847036fd7e3 |
Update WatchGuard Fireware OS to patch the integer overflow vulnerability in WebSocket handling.
- Update WatchGuard Fireware OS to the latest version.
- Disable the Access Portal feature if update is not possible.
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-93866.
| URL | Resource |
|---|---|
| https://psirt.watchguard.com/CVE-2026-93866 |
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-93866 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-93866
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-93866 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-93866 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 5d1c2695-1a31-4499-88ae-e847036fd7e3
十月. 27, 2026
Action Type Old Value New Value Added Description An integer overflow vulnerability in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal allows a remote, unauthenticated attacker to write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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 Added CWE CWE-787 Added CWE CWE-190 Added CWE CWE-288 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/93xxx/CVE-2026-93866.json">CVE-2026-93866</a> Added Reference https://psirt.watchguard.com/CVE-2026-93866
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.