CVE-2026-71553: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in apostrophecms apostrophe
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.
AI Analysis
Technical Summary
CVE-2026-71553 describes a prototype pollution vulnerability (CWE-1321) in ApostropheCMS, an open-source Node.js content management system. In versions 4.32.0 and earlier, the PATCH /api/v1/article/:id endpoint improperly accepts the inherited path toString.call and passes it to apos.util.set() and apos.util.get(). This allows an authenticated editor to overwrite the shared Object.prototype.toString function's call property. The modification causes a persistent process-wide denial of service condition that lasts until the process is restarted.
Potential Impact
An authenticated editor can cause a denial of service affecting the entire ApostropheCMS process by exploiting this vulnerability. The denial of service is persistent until the process is restarted, potentially disrupting availability of the CMS.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is documented at this time.
CVE-2026-71553: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in apostrophecms apostrophe
Description
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.
CVSS v4.0
Score 7.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-71553 describes a prototype pollution vulnerability (CWE-1321) in ApostropheCMS, an open-source Node.js content management system. In versions 4.32.0 and earlier, the PATCH /api/v1/article/:id endpoint improperly accepts the inherited path toString.call and passes it to apos.util.set() and apos.util.get(). This allows an authenticated editor to overwrite the shared Object.prototype.toString function's call property. The modification causes a persistent process-wide denial of service condition that lasts until the process is restarted.
Potential Impact
An authenticated editor can cause a denial of service affecting the entire ApostropheCMS process by exploiting this vulnerability. The denial of service is persistent until the process is restarted, potentially disrupting availability of the CMS.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is documented at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-06T21:24:15.376Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a836b03bf8831d53980daed
Added to database: 08/17/2026, 20:11:47 UTC
Last enriched: 08/17/2026, 20:26:07 UTC
Last updated: 08/18/2026, 01:02:51 UTC
Views: 7
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