CVE-2020-7741
CVE-2020-7741 is a critical-severity vulnerability in Hello.js Project Hello.js with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Critical (CVSS 3.x base score 9.9)
- CVSS v2: 7.5
- EPSS exploit prediction: 1% (74th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Hello.js Project Hello.js
- Published:
- Last modified:
Description
This affects the package hellojs before 1.18.6. The code get the param oauth_redirect from url and pass it to location.assign without any check and sanitisation. So we can simply pass some XSS payloads into the url param oauth_redirect, such as javascript:alert(1).
Frequently asked questions
- What is CVE-2020-7741?
- This affects the package hellojs before 1.18.6. The code get the param oauth_redirect from url and pass it to location.assign without any check and sanitisation. So we can simply pass some XSS payloads into the url param oauth_redirect, such as javascript:alert(1).
- How severe is CVE-2020-7741?
- CVE-2020-7741 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
- Is CVE-2020-7741 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-7741?
- CVE-2020-7741 affects Hello.js Project Hello.js. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-7741?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2020-7741 published?
- CVE-2020-7741 was published on 2020-10-06 and last updated on 2026-06-17.
References
- https://github.com/MrSwitch/hello.js/blob/3b79ec93781b3d7b9c0b56f598e060301d1f3e73/dist/hello.all.js%23L1545
- https://github.com/MrSwitch/hello.js/commit/d6f5137f30de6e0ef7048191ee6ae575fdc2f669
- https://snyk.io/vuln/SNYK-JS-HELLOJS-1014546
Affected products (1)
- cpe:2.3:a:hello.js_project:hello.js:*:*:*:*:*:node.js:*:*
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