VulnerabilityPublished 2 Nov 2026

CVE-2026-120323: samanhappy MCPHub · Information Disclosure

Affects samanhappy MCPHubSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium · fixed in 1.1.8 : update samanhappy MCPHub when convenient.

Data as of 2 Nov 2026, 02:28 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (VulDB)	CVSS 4.0	5.3
CNA (VulDB)	CVSS 3.1	4.3
CNA (VulDB)	CVSS 3.0	4.3
CNA (VulDB)	CVSS 2.0	5.0

Patch: Available – fixed in 1.1.8

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: Passive
Vulnerable system confidentiality: Low
Vulnerable system integrity: None
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 1 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
samanhappyMCPHub	Affected 1.0.0 – 1.1.7 54 affected builds	Fixed in–
npmsamanhappy/mcphub`pkg:npm/samanhappy/mcphub`Other threats	Affected 1.0.0 – 1.1.7 54 affected builds	Fixed in–

CPE configurations (1)

cpe:2.3:a:samanhappy:mcphub:*:*:*:*:*:*:*:*

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade samanhappy MCPHub to version 1.1.8, which contains the official fix for this vulnerability. No additional mitigation steps are indicated by the vendor advisory.

Description

CVE-2026-120323 is an information disclosure vulnerability in samanhappy MCPHub affecting versions up to 1.0.45 and 1.1.7. The flaw involves manipulation of the passthroughHeaders argument in the file src/utils/passthroughHeaders.ts, allowing remote attackers to disclose information. Upgrading to version 1.1.8 addresses this issue.

Impact

The vulnerability allows remote attackers to disclose information by manipulating the passthroughHeaders argument. The impact is limited to information disclosure without privilege requirements or user interaction, resulting in a medium severity rating (CVSS 5.3). There is no indication of active exploitation in the wild.

Summary

This vulnerability in samanhappy MCPHub (up to versions 1.0.45 and 1.1.7) arises from improper handling of the passthroughHeaders argument in the source file src/utils/passthroughHeaders.ts. An attacker can remotely manipulate this argument to cause information disclosure. The issue is fixed in version 1.1.8, with the patch identified by commit 040f7b9ae004070bdfe5084cde6bc2c609f78e76.

References

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