How severe is CVE-2025-47930?

CVE-2025-47930 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-47930 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-47930?

CVE-2025-47930 affects Zulip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-47930?

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

Does CVE-2025-47930 have an EU (EUVD) identifier?

Yes. CVE-2025-47930 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28135.

When was CVE-2025-47930 published?

CVE-2025-47930 was published on 2025-05-16 and last updated on 2026-06-17.

CVE-2025-47930

CVE-2025-47930 is a medium-severity vulnerability in Zulip with a CVSS 3.x base score of 5.3. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 5.3
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-28135
Weakness: CWE-863
Affected product: Zulip
Published: 2025-05-16
Last modified: 2026-06-17

Description

Zulip is an open-source team chat application. Starting in version 10.0 and prior to version 10.3, the "Who can create public channels" access control mechanism can be circumvented by creating a private or web-public channel, and then changing the channel privacy to public. A similar technique works for creating private channels without permission, though such a process requires either the API or modifying the HTML, as we do mark the "private" radio button as disabled in such cases. Version 10.3 contains a patch.

Frequently asked questions

What is CVE-2025-47930?: Zulip is an open-source team chat application. Starting in version 10.0 and prior to version 10.3, the "Who can create public channels" access control mechanism can be circumvented by creating a private or web-public channel, and then changing the channel privacy to public. A similar technique works for creating private channels without permission, though such a process requires either the API or modifying the HTML, as we do mark the "private" radio button as disabled in such cases. Version 10.3 contains a patch.
How severe is CVE-2025-47930?: CVE-2025-47930 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-47930 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-47930?: CVE-2025-47930 affects Zulip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-47930?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-47930 have an EU (EUVD) identifier?: Yes. CVE-2025-47930 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-28135.
When was CVE-2025-47930 published?: CVE-2025-47930 was published on 2025-05-16 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Zulip

CVE-2021-3967 — High (CVSS 8.8): Improper Access Control in GitHub repository zulip/zulip prior to 4.10.
CVE-2021-43799 — High (CVSS 8.6): Zulip is an open-source team collaboration tool. Zulip Server installs RabbitMQ for internal message passing. In…
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CVE-2016-4427 — High (CVSS 7.5): In zulip before 1.3.12, deactivated users could access messages if SSO was enabled.
CVE-2023-28623 — Medium (CVSS 6.5): Zulip is an open-source team collaboration tool with unique topic-based threading. In the event that 1:…
CVE-2021-43791 — Medium (CVSS 6.5): Zulip is an open source group chat application that combines real-time chat with threaded conversations. In affected…

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Other CWE-863 (Incorrect Authorization) vulnerabilities

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CVE-2026-33105 — Critical (CVSS 10.0): Improper authorization in Microsoft Azure Kubernetes Service allows an unauthorized attacker to elevate privileges over…
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Browse all CWE-863 (Incorrect Authorization) vulnerabilities →