How severe is CVE-2023-32678?

CVE-2023-32678 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2023-32678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-32678?

CVE-2023-32678 affects Zulip Zulip Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-32678?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-32678 published?

CVE-2023-32678 was published on 2023-08-25 and last updated on 2026-06-17.

CVE-2023-32678

CVE-2023-32678 is a medium-severity vulnerability in Zulip Zulip Server with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-285
Affected product: Zulip Zulip Server
Published: 2023-08-25
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2023-32678?: 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.
How severe is CVE-2023-32678?: CVE-2023-32678 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2023-32678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-32678?: CVE-2023-32678 affects Zulip Zulip Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-32678?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-32678 published?: CVE-2023-32678 was published on 2023-08-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:*

More vulnerabilities in Zulip Zulip Server

CVE-2019-18933 — Critical (CVSS 9.8): In Zulip Server versions from 1.7.0 to before 2.0.7, a bug in the new user signup process meant that users who…
CVE-2020-15070 — High (CVSS 8.8): Zulip Server 2.x before 2.1.7 allows eval injection if a privileged attacker were able to write directly to the…
CVE-2017-0910 — High (CVSS 8.8): In Zulip Server before 1.7.1, on a server with multiple realms, a vulnerability in the invitation system lets an…
CVE-2025-31478 — High (CVSS 8.2): Zulip is an open-source team collaboration tool. Zulip supports a configuration where account creation is limited…
CVE-2023-33186 — High (CVSS 8.2): Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and…
CVE-2024-36612 — High (CVSS 7.5): Zulip from 8.0 to 8.3 contains a memory leak vulnerability in the handling of popovers.

All CVEs affecting Zulip Zulip Server →

Other CWE-285 (Improper Authorization) vulnerabilities

CVE-2025-65041 — Critical (CVSS 10.0): Improper authorization in Microsoft Partner Center allows an unauthorized attacker to elevate privileges over a network.
CVE-2023-33189 — Critical (CVSS 10.0): Pomerium is an identity and context-aware access proxy. With specially crafted requests, incorrect authorization…
CVE-2022-2595 — Critical (CVSS 10.0): Improper Authorization in GitHub repository kromitgmbh/titra prior to 0.79.1.
CVE-2021-28799 — Critical (CVSS 10.0): An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If…
CVE-2026-34048 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
CVE-2026-5412 — Critical (CVSS 9.9): In Juju versions prior to 2.9.57 and 3.6.21, an authorization issue exists in the Controller facade. An authenticated…

Browse all CWE-285 (Improper Authorization) vulnerabilities →