What’s Vulnerable › Vulnerabilities

CVE-2021-3866: Cross-site Scripting (XSS) - Stored in zulip/zulip

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-20 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.

Affected products

• zulip: through 4.8

References

• https://blog.zulip.com/2022/01/19/cve-2021-3866/
• https://github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6
• https://huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2
• https://blog.zulip.com/2022/01/19/cve-2021-3866/
• https://github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6
• https://huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2

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