PatchTheCVECVE-2020-8823: htmlfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile
CVE-2020-8823 is a medium-severity flaw (CVSS 6.1) affecting sockjs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
htmlfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile c (aka callback) parameter.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.1 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 1.9% (top 21%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2020-02-10 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-8823?
sockjs: upgrade to 0.3.0. Exact commands for each OS are on this page.
Is CVE-2020-8823 being exploited?
CVE-2020-8823 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-8823 affect?
CVE-2020-8823 affects sockjs. Severity is medium (CVSS 6.1). htmlfile in lib/transport/htmlfile.js in SockJS before 0.3.0 is vulnerable to Reflected XSS via the /htmlfile c (aka callback) parameter.
How urgent is CVE-2020-8823?
Priority 46/100. Public exploit reference
Related CVEs
- CVE-2020-7693 MEDIUM 5.3 UPGRADE Incorrect handling of Upgrade header with the value websocket leads in crashing of containers hosting sockjs a