CVE-2026-78654: Improperly Controlled Modification of Object Prototype Attributes in cleverbrush framework
Description
CVE-2026-78654 is a medium severity vulnerability in the cleverbrush framework up to version 4.4.0. It affects the deepExtend function in the libs/deep/src/deepExtend.ts file, allowing improper modification of object prototype attributes. This flaw can be exploited remotely without authentication. The issue is fixed in version 4.4.1.
CVSS v4.0
Score 6.9medium
Affected software
cleverbrush
framework
cleverbrush
deep
pkg:github/cleverbrush/frameworkcpe:2.3:a:cleverbrush:framework:*:*:*:*:*:*:*:*cpe:2.3:a:cleverbrush:deep:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in cleverbrush framework versions 4.0 through 4.4.0 involves the deepExtend function improperly controlling modifications to object prototype attributes. Such a flaw can lead to prototype pollution, potentially enabling attackers to manipulate application behavior remotely. The vulnerability has a CVSS 4.0 base score of 6.9, indicating medium severity. A patch identified by commit 810398c1308c500c3b8b6af380b5a89371389327 is available in version 4.4.1 to remediate the issue.
Potential Impact
The vulnerability allows remote attackers to manipulate object prototype attributes, which can lead to unexpected application behavior or security bypasses. The CVSS score of 6.9 reflects a medium impact with network attack vector and no privileges or user interaction required. However, the impact is limited by the vulnerability's scope and complexity as indicated by the CVSS vector.
Mitigation Recommendations
Upgrade the cleverbrush framework to version 4.4.1 or later, which contains the official fix for this vulnerability. Applying this update will remediate the improper prototype attribute modification issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-08-24T23:08:18.011Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8d318cacd9273b49c4850f
Added to database: 08/25/2026, 06:09:16 UTC
Last enriched: 09/10/2026, 20:18:42 UTC
Last updated: 10/08/2026, 18:48:48 UTC
Views: 72
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.