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TI-2021-02796 Aliases CVE-2021-3866GHSA-c9g2-65fq-w8q5

Cross-site Scripting (XSS) - Stored in zulip/zulip

Priority LOW 26CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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

Why it matters now

EPSS 0.0089 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed zulip/zulip (zulip): 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
zulipzulip/zulip44f935695d452cc3fb16845a0c6af710438b153d and later; before 3eb2791c3e9695f7d37ffe84e0c2184fae665cb63eb2791c3e9695f7d37ffe84e0c2184fae665cb6Patch availableCNA
  • zulip/zulip Vendorzulip Affected 44f935695d452cc3fb16845a0c6af710438b153d and later; before 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6 Fixed in 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:zulip:zulip:*:*:*:*:*:*:*:*up to 4.8Vulnerablezulip
  • cpe:2.3:a:zulip:zulip:*:*:*:*:*:*:*:* Versions up to 4.8 Vulnerable ·zulip

Remediation

  • Fix · CNA zulip/zulip (zulip) Fixed in 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3866
  2. 2026-10-03 Alias added: GHSA-c9g2-65fq-w8q5

References

Exploit 1

Patch 1

Advisory 1

  • TI-2026-20810 Zulip: Anonymous File Access After Disabling Spectator Access CVSS 3.1MEDIUM 5.3
  • TI-2026-21062 Zulip: Path Traversal in Import CVSS 3.1MEDIUM 6.1
  • TI-2021-19605 RabbitMQ exposes ports with weak default secrets in Zulip Server CVSS 3.1CRITICAL 9.8
  • TI-2023-15953 Users who can send invitations can erroneously add users to streams during invitation in Zulip CVSS 3.1LOW 3.1
  • TI-2022-13210 Zulip Server insufficient authorization for changing bot roles CVSS 3.1HIGH 8.8
  • TI-2021-02864 Improper Access Control in zulip/zulip CVSS 3.1HIGH 8.8
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences