CVE-2021-47963
CVE-2021-47963 is a high-severity vulnerability with a CVSS 3.x base score of 7.2. 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: High (CVSS 3.x base score 7.2)
- CVSS v4: 5.1
- EPSS exploit prediction: 0% (37th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2021-34816
- Weakness: CWE-79
- Published:
- Last modified:
Description
Anote 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to execute arbitrary code by injecting malicious payloads into markdown files stored within the application. Attackers can craft malicious markdown files with embedded JavaScript that executes system commands when opened, enabling remote code execution on the victim's computer.
Frequently asked questions
- What is CVE-2021-47963?
- Anote 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to execute arbitrary code by injecting malicious payloads into markdown files stored within the application. Attackers can craft malicious markdown files with embedded JavaScript that executes system commands when opened, enabling remote code execution on the victim's computer.
- How severe is CVE-2021-47963?
- CVE-2021-47963 has a CVSS 3.x base score of 7.2, rated high 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 none.
- Is CVE-2021-47963 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2021-47963?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2021-47963 have an EU (EUVD) identifier?
- Yes. CVE-2021-47963 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34816.
- When was CVE-2021-47963 published?
- CVE-2021-47963 was published on 2026-05-15 and last updated on 2026-06-17.
References
- https://github.com/AnotherNote/anote
- https://www.exploit-db.com/exploits/49836
- https://www.vulncheck.com/advisories/anote-persistent-cross-site-scripting-remote-code-execution
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