VulnerabilityPublished 8 Apr 2026

CVE-2026-39885: agentfront frontmcp · Server-Side Request Forgery (SSRF)

Affects agentfront frontmcpSource CVE Database V5

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Not known to be exploited · CVSS 7.5 High : upgrade to 1.0.4 soon.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

7.5High

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.0.4, 2.3.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Apr 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 30 Oct 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

Upgrade frontmcp and adapters and sdk and agentfront/frontmcp to 1.0.4; mcp-from-openapi to 2.3.0.

Affected software

Product	Affected	Fixed in
agentfrontfrontmcp	Affected <1.0.4	Fixed in 1.0.4
@frontmcpadapters	Affected <1.0.4	Fixed in 1.0.4
@frontmcpsdk	Affected <1.0.4	Fixed in 1.0.4
frontmcpmcp-from-openapi	Affected <2.3.0	Fixed in 2.3.0
GitHubagentfront/frontmcp`pkg:github/agentfront/frontmcp`Other threats	Affected <1.0.4	Fixed in 1.0.4

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

AI-suggested

Upgrade to frontmcp version 2.3.0 or later, where this vulnerability is fixed. Monitor vendor advisories for any additional guidance. No other mitigations are specified.

Description

CVE-2026-39885 is a Server-Side Request Forgery (SSRF) vulnerability in the frontmcp product by agentfront, specifically in versions prior to 1.0.4. The vulnerability arises because the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without restricting URLs or using custom resolvers. This allows malicious OpenAPI specs to cause the server to fetch internal network resources, cloud metadata endpoints, or local files during initialization, enabling SSRF and local file read attacks. The vulnerability has a high severity with a CVSS score of 7.5.

Impact

Successful exploitation can lead to unauthorized server-side requests to internal network addresses, cloud metadata endpoints, or local files, potentially exposing sensitive information. The confidentiality impact is high, but integrity and availability impacts are not indicated. There are no known exploits in the wild at this time.

Summary

The frontmcp framework (agentfront) versions before 1.0.4 contain a SSRF vulnerability (CWE-918) due to the mcp-from-openapi library's use of @apidevtools/json-schema-ref-parser without URL restrictions when dereferencing $ref pointers in OpenAPI specs. This allows an attacker to supply a malicious OpenAPI specification that triggers server-side requests to internal or local resources during the initialize() call, potentially exposing sensitive internal network data or local files. The vulnerability is fixed in version 2.3.0 of the framework. The CVSS 3.1 score is 7.5 (high severity), reflecting network attack vector, low complexity, no privileges required, no user interaction, and high confidentiality impact.

CWE-918Server-Side Request Forgery (opens in a new tab)
Base weaknessCWE Top 25 (2025): #22OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Implementation · Operation
If there is a known list of applications, IP, hostname, and/or domains to which the product is allowed to communicate, then use allowlists to ensure that outgoing requests are restricted to these known entities. The allowlists could be in the application code or possibly enforced by firewalls or network segmentation.
Implementation · Operation
If the product is expected to be able to connect to arbitrary IP addresses or domains, consider using a denylist that includes private network addresses, internal domain names, etc. The denylist could be in the application code or possibly enforced by firewalls or network segmentation.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Unvalidated Redirects and Forwards (opens in a new tab)
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V12.6.1 (opens in a new tab)
V5.2.6 (opens in a new tab)
Attack patterns
Server Side Request Forgery (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Apr 2026, 12:15 UTC

WeaknessesCWE-918

Technical details

References

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