CVE-2026-105844: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in payloadcms payload
Description
### Impact An unauthenticated user could cause unintended application behavior when the Import Export plugin is enabled, allowing an attacker to submit and execute remote code (RCE). Applications that do not use `@payloadcms/plugin-import-export` are not affected. ### Patches Users should upgrade Payload packages to `>= 3.88.0` or `>= 4.0.0-canary.27.` ### Workarounds Upgrading is recommended. Until then, disable the Import Export plugin or restrict access to its endpoints.
CVSS v4.0
Score 9.3critical
Affected software
payloadcms
payload
@payloadcms
plugin-import-export
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-105844 is a prototype pollution vulnerability (CWE-1321) in PayloadCMS, specifically when the @payloadcms/plugin-import-export plugin is enabled. Unauthenticated attackers can manipulate object prototype attributes by submitting crafted field paths, causing unexpected application behavior that can escalate to remote code execution. The vulnerability affects PayloadCMS versions >=3.0.0 <3.88.0 and canary versions >=4.0.0-canary.0 <4.0.0-canary.27. The vulnerability has a CVSS 4.0 score of 9.3, indicating critical severity. The issue is resolved in versions 3.88.0 and 4.0.0-canary.27.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to perform prototype pollution via the import-export plugin, potentially leading to remote code execution. This can result in full compromise of the affected PayloadCMS instance.
Mitigation Recommendations
Upgrade PayloadCMS to version 3.88.0 or later, or to 4.0.0-canary.27 or later for canary releases. This vulnerability is fixed in these versions. No other mitigation is required if the upgrade is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-05T23:06:29.747Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac51bef2cdf04f656c18ed9
Added to database: 10/06/2026, 16:03:59 UTC
Last enriched: 10/06/2026, 16:18:23 UTC
Last updated: 10/06/2026, 21:42:12 UTC
Views: 13
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