XSS in Zulip
CVE-2021-3866
Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 57.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Zulip
- Zulip Zulip/zulip — versions 44f935695d452cc3fb16845a0c6af710438b153d, unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2 (Exploit, Third Party Advisory)
- github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6 (Patch, Third Party Advisory)
- blog.zulip.com/2022/01/19/cve-2021-3866/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-3866?
- CVE-2021-3866 is a medium-severity vulnerability in Zulip, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-01-20.
- How severe is CVE-2021-3866?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2021-3866 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.