Cross-site scripting via unescaped transfer-state serialization
Published Jan 14, 2021 · Updated Sep 16, 2024
Cross-site scripting in HeroDevs Scully before 1.0.9 allows remote attackers to execute script through crafted transfer-state data. TransferStateService.saveState inserts JSON.stringify output directly into an executable script element without escaping closing-script characters, allowing serialized data to terminate the element and introduce attacker-controlled markup. Exploitation requires attacker influence over data captured during prerendering and a visitor to load the generated page; injected script then runs in that page's origin.
Summary
What happened
Cross-site scripting in HeroDevs Scully before 1.0.9 allows remote attackers to execute script through crafted transfer-state data. TransferStateService.saveState inserts JSON.stringify output directly into an executable script element without escaping closing-script characters, allowing serialized data to terminate the element and introduce attacker-controlled markup. Exploitation requires attacker influence over data captured during prerendering and a visitor to load the generated page; injected script then runs in that page's origin.
The record
- CVE
- CVE-2020-28470
- Published
- Jan 14, 2021
- Updated
- Sep 16, 2024
- Vendor
- HeroDevs
- Product
- Scully
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 14, 2021CVE publishedPublication date reported by the CVE source.
- Sep 16, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=unspecified <1.0.9
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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