TI-2023-15954 Aliases CVE-2023-32678

Improper authorization in zulip

LOW 29CWE-285Published 2023-08-25 · Updated 2024-09-30

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-285.

Summary

Zulip is an open-source team collaboration tool with topic-based threading that combines email and chat. Users who used to be subscribed to a private stream and have been removed from it since retain the ability to edit messages/topics, move messages to other streams, and delete messages that they used to have access to, if other relevant organization permissions allow these actions. For example, a user may be able to edit or delete their old messages they posted in such a private stream. An administrator will be able to delete old messages (that they had access to) from the private stream. This issue was fixed in Zulip Server version 7.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0048 41st percentileScored 2026-11-07

Fix Fixed zulip (zulip): 7.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
zulip	zulip	before 7.3	7.3	Patch available	CNA

zulip Vendorzulip Affected before 7.3 Fixed in 7.3 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zulip:zulip_server::::::::	before 7.3	Vulnerable	zulip

cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:* Versions before 7.3 Vulnerable ·zulip

Remediation

Fix · CNA zulip (zulip) Fixed in 7.3

Timeline

2026-10-02 Threatist record created from CVE-2023-32678

References

Advisory 1

https://github.com/zulip/zulip/security/advisories/GHSA-q3wg-jm9p-35fj

Other 1

https://zulip.readthedocs.io/en/latest/overview/changelog.html#zulip-server-7-3

TI-2024-37129 /api/v1/jwt/fetch_api_key endpoint can leak if an email address has an account in Zulip server CVSS 4.0MEDIUM 6.9
TI-2022-06082 Multi-use invitations can grant access to other organizations in Zulip CVSS 3.1CRITICAL 9.8
TI-2019-13649 In Zulip Server versions from 1.7.0 to before 2.0.7, a bug in the new user signup process… CVSS 3.1CRITICAL 9.8
TI-2025-22659 Zulip Authentication Backend Configuration Bypass CVSS 3.1HIGH 8.2
TI-2024-24345 Zulip from 8.0 to 8.3 contains a memory leak vulnerability in the handling of popovers. CVSS 3.1HIGH 7.5
TI-2020-11848 Zulip Server 2.x before 2.1.7 allows eval injection if a privileged attacker were able to… CVSS 3.1HIGH 8.8

See all 39 →

Sources

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