PatchTheCVECVE-2019-18949: SnowHaze before 2.6.6 is sometimes too late to honor a per-site JavaScript blocking setting, which leads to un
CVE-2019-18949 is a high-severity flaw (CVSS 7.5) affecting snowhaze. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
SnowHaze before 2.6.6 is sometimes too late to honor a per-site JavaScript blocking setting, which leads to unintended JavaScript execution via a chain of webpage redirections targeted to the user's browser configuration.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.4% (top 27%) |
| CISA exploited list | No |
| Weakness | CWE-863 |
| Published | 2019-11-14 |
| 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-2019-18949?
snowhaze: upgrade to 2.6.6. Exact commands for each OS are on this page.
Is CVE-2019-18949 being exploited?
CVE-2019-18949 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-2019-18949 affect?
CVE-2019-18949 affects snowhaze. Severity is high (CVSS 7.5). SnowHaze before 2.6.6 is sometimes too late to honor a per-site JavaScript blocking setting, which leads to unintended JavaScript execution via a chain of webpage redirections targeted to the user's browser configuration.
How urgent is CVE-2019-18949?
Priority 49/100. High severity; Remotely exploitable, no login, no user action