Local data exposure via query-string prototype pollution
Published Jan 22, 2023 · Updated Apr 2, 2025
Prototype pollution in pyLoad before 0.5.0b3.dev41 allows local users to inject properties into Object.prototype through the web UI. The bundled MooTools More parseQueryString function follows attacker-controlled proto or constructor[prototype] keys and assigns their values without blocking prototype paths. Local access is required; the published assessment supports limited data exposure, not data modification or service interruption.
Summary
What happened
Prototype pollution in pyLoad before 0.5.0b3.dev41 allows local users to inject properties into Object.prototype through the web UI. The bundled MooTools More parseQueryString function follows attacker-controlled proto or constructor[prototype] keys and assigns their values without blocking prototype paths. Local access is required; the published assessment supports limited data exposure, not data modification or service interruption.
The record
- CVE
- CVE-2023-0435
- Published
- Jan 22, 2023
- Updated
- Apr 2, 2025
- Vendor
- pyLoad
- Product
- pyLoad
- Classifications
- CWE-1125
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 22, 2023CVE publishedPublication date reported by the CVE source.
- Apr 2, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <0.5.0b3.dev41
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- MooTools More parseQueryString prototype-pollution proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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