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ApostropheCMS CVE-2026-71553

| EUVDEUVD-2026-60442 HIGH
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-08-17 GitHub_M
Prototype Pollution Denial Of Service Node.js Apostrophe
7.1
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.1 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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
vuln.today AI
7.1 HIGH

Network-reachable REST API exploitable with only an editor session (PR:L); a single request causes persistent high-availability impact via process-wide prototype corruption, with no confidentiality impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 17, 2026 - 20:33 vuln.today
Analysis Generated
Aug 17, 2026 - 20:33 vuln.today
CVE Published
Aug 17, 2026 - 20:03 cve.org
HIGH 7.1

DescriptionCVE.org

ApostropheCMS is an open-source Node.js content management system. In 4.32.0 and earlier, PATCH /api/v1/article/:id accepts the inherited path toString.call and passes it through the utility module to apos.util.set() and apos.util.get(), allowing an authenticated editor to overwrite the shared Object.prototype.toString function's call property and cause a persistent process-wide denial of service until restart.

Articles & Coverage 1

News 4 New Node.js Vulnerabilities - 2 Critical, 2 With POC Aug 18, 2026

AnalysisAI

Prototype pollution in ApostropheCMS 4.32.0 and earlier enables an authenticated editor to trigger a persistent, process-wide denial of service via a single PATCH REST API request. By sending { "toString.call": "x" } to PATCH /api/v1/article/:id, the attacker walks the JavaScript prototype chain through apos.util.set() into the shared Object.prototype.toString function object and shadows its call method, breaking every subsequent Object.prototype.toString.call() invocation in Node.js - including those inside the MongoDB driver - until the server process is manually restarted. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Obtain editor-level credentials
Delivery
Send single PATCH /api/v1/article/:id with body {"toString.call":"x"}
Exploit
apos.util.set() traverses inherited toString to Object.prototype.toString
Install
Shadows Object.prototype.toString.call process-wide
C2
MongoDB driver and Node.js internals throw on toString.call()
Execute
Site returns errors on all requests
Impact
Downtime persists until manual process restart
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid editor-level authenticated session in the ApostropheCMS instance (CVSS PR:L confirmed). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 7.1 captures the core risk profile: network-accessible (AV:N), low complexity (AC:L), low-privilege authentication required (PR:L), no user interaction (UI:N), high availability impact (VA:H), and low integrity impact (VI:L) with no confidentiality or subsequent-system impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who holds, steals, or socially engineers an editor-level ApostropheCMS account sends one HTTP PATCH request to `/api/v1/article/:id` with the JSON body `{ "toString.call": "x" }`. The `apos.util.set()` function walks the `toString` segment from the plain object to `Object.prototype.toString` - a function shared by the entire Node.js process - and writes the string `"x"` to its `call` property. …
Remediation The upstream fix is present in commit 5a3746aaed49761e171c2cbfe793267c959829fd (https://github.com/apostrophecms/apostrophe/commit/5a3746aaed49761e171c2cbfe793267c959829fd); however, the specific npm package version incorporating this patch is not stated in the available data and was not independently confirmed - organizations should consult the npm registry and the advisory at https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-vmg4-6gfg-83qx for the definitive patched release and upgrade to it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, restrict PATCH API access to /api/v1/article/:id to trusted administrators only and audit active editor accounts for unauthorized users. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Same technique Denial Of Service

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CVE-2026-71553 vulnerability details – vuln.today
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