VulnerabilityPublished 26 Jun 2026

CVE-2026-54753: nrwl nx · Exposed Dangerous Method or Function

Affects nrwl nxSource CVE Database V5

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Not known to be exploited · CVSS 5.9 Medium : upgrade to 23.0.0-beta.2 or 22.7.2 when convenient.

Data as of 8 Nov 2026, 23:24 UTC

CVSS 3.1 base score

5.9Medium

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

EPSS: 1.4% chance of exploitation in 30 days – higher than 73% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 23.0.0-beta.2, 22.7.2

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

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: Low
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: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
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: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
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: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on 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 26 Jun 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 8 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

Upgrade nrwl nx to 23.0.0-beta.2 or 22.7.2.

Affected software

Product	Affected	Fixed in
nrwlnx	Affected >=23.0.0-beta.0 <23.0.0-beta.2	Fixed in 23.0.0-beta.2
nrwlnx	Affected >=17.0.4 <22.7.2	Fixed in 22.7.2

AI-suggested

A fix is available in nrwl nx versions 22.7.2 and later, and 23.0.0 and later (including 23.0.0-beta.2). Users running affected versions (>=17.0.4 <22.7.2 and >=23.0.0-beta.0 <23.0.0-beta.2) should upgrade to these patched versions to remove the wildcard CORS header and prevent cross-origin information disclosure. The vendor advisory confirms the fix and no additional mitigations are required beyond upgrading. The 21.x line is unpatched and should be upgraded as well.

Description

## Summary The local HTTP server started by `nx graph` sent `Access-Control-Allow-Origin: *` on every response, letting any website a developer visited read the server's responses cross-origin — including the full project graph and the output of the `/help` endpoint, which runs a target's configured help command. The practical impact is typically **cross-origin information disclosure**, but can be arbitrary command injection in rare cases. ## Severity Exploitation requires the developer to be running `nx graph` and to visit an attacker page. Any execution beyond benign help commands also requires a malicious target to already be present in the workspace (see Details). ## Affected & Patched Versions Package: `nx` (npm). - **Affected:** `>= 17.0.4, < 22.7.2` and `>= 23.0.0-beta.0, < 23.0.0-beta.2` - **Patched:** `22.7.2`+ (backport) and `23.0.0` (first in `23.0.0-beta.2`) The wildcard CORS header was introduced in `17.0.4`; the `/help` execution endpoint in `19.4.0`. **The `21.x` line is not patched** — `21.x` users should upgrade to `22.7.2` or later. ## Details `nx graph` starts a local server (default `http://127.0.0.1:4211`). Before the fix, its request handler set a wildcard CORS header on every response: ```ts res.setHeader('Access-Control-Allow-Origin', '*'); ``` The `/help` endpoint runs a target's configured command: ```ts const command = target.metadata?.help?.command; return execSync(command, { cwd: target.options?.cwd ?? workspaceRoot }).toString(); ``` A `GET /help` is a CORS "simple request", so a malicious page could `fetch()` it with no preflight, and the wildcard header let the page read the result. This exposes the project graph (project names, file paths, dependencies, build configuration) and the output of any configured help command. The command is not attacker-controlled through the request — it comes from the workspace's project configuration, and first-party plugins (jest, vite, cypress) populate it with benign, read-only help commands. For `/help` to run anything malicious, a target carrying a malicious `help.command` must already exist in the project graph, which can only be introduced by **installing a malicious package** or by **altering the workspace's own code/configuration** — both of which already grant code execution independent of this flaw. The fix ([#35494](https://github.com/nrwl/nx/pull/35494)) removes the header; the browser's same-origin policy then blocks cross-origin reads. ## References - Fix: [nrwl/nx#35494](https://github.com/nrwl/nx/pull/35494) - Introduced: [nrwl/nx#20744](https://github.com/nrwl/nx/pull/20744) (CORS), [nrwl/nx#26629](https://github.com/nrwl/nx/pull/26629) (`/help`) ## Credits Thanks to Nozomu Sasaki (Paul) ([@morimori-dev](https://github.com/morimori-dev)) for finding and responsibly reporting this issue.

Impact

The primary impact is cross-origin information disclosure, exposing the full project graph and help command outputs to any website visited by a developer running `nx graph`. This can leak project names, file paths, dependencies, and build configurations. Arbitrary command injection is theoretically possible but requires a malicious target to already exist in the workspace, which implies prior compromise or installation of malicious packages. There are no known exploits in the wild. The CVSS v3.1 base score is 5.9 (medium severity), reflecting network attack vector, high complexity, user interaction required, and high confidentiality impact with low integrity impact.

Summary

The vulnerability (CVE-2026-54753) in nrwl nx arises from the local HTTP server started by `nx graph` setting the `Access-Control-Allow-Origin: *` header on all responses, including the `/help` endpoint which runs a configured help command for a target. This allows any website a developer visits to perform cross-origin requests and read sensitive information such as the project graph and help command output. The help command executed is derived from the workspace configuration and is not attacker-controlled via the request, limiting the risk of arbitrary command execution to scenarios where a malicious target is already present in the workspace. The vulnerability was introduced in version 17.0.4 (CORS header) and 19.4.0 (`/help` endpoint). It is patched in 22.7.2 and 23.0.0 (starting from 23.0.0-beta.2). The fix removes the wildcard CORS header, enforcing same-origin policy and preventing cross-origin reads.

CWE-749Exposed Dangerous Method or Function (opens in a new tab)
Base weaknessLikelihood of exploit: LowOWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted.
Architecture and Design
If you must expose a method, make sure to perform input validation on all arguments, limit access to authorized parties, and protect against all possible vulnerabilities.
Architecture and Design · Implementation · Attack Surface Reduction
Identify all exposed functionality. Explicitly list all functionality that must be exposed to some user or set of users. Identify which functionality may be: accessible to all users; restricted to a small set of privileged users; prevented from being directly accessible at all
OWASP Cheat Sheets
Third Party Javascript Management (opens in a new tab)
Authorization (opens in a new tab)
OWASP ASVS 4.0.3
V14.5.1 (opens in a new tab)
V10.1.1 (opens in a new tab)
V1.4.4 (opens in a new tab)
Attack patterns
WebView Injection (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-942Permissive Cross-domain Security Policy with Untrusted Domains (opens in a new tab)
Variant weaknessOWASP Top 10 A02:2025: Security Misconfiguration (opens in a new tab)
The product uses a web-client protection mechanism such as a Content Security Policy (CSP) or cross-domain policy file, but the policy includes untrusted domains with which the web client is allowed to communicate.
Architecture and Design · Operation · Attack Surface Reduction
Define a restrictive Content Security Policy or cross-domain policy file.
Architecture and Design · Operation · Attack Surface Reduction
Avoid using wildcards in the CSP / cross-domain policy file. Any domain matching the wildcard expression will be implicitly trusted, and can perform two-way interaction with the target server.
Architecture and Design · Operation · Environment Hardening
For Flash, modify crossdomain.xml to use meta-policy options such as 'master-only' or 'none' to reduce the possibility of an attacker planting extraneous cross-domain policy files on a server.
OWASP ASVS 4.0.3
V8.3.8 (opens in a new tab)
V1.14.1 (opens in a new tab)
V13.4.2 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 31 Jul 2026, 21:30 UTC

WeaknessesCWE-749, CWE-942

Technical details

References

Community reviews

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