How severe is CVE-2025-52559?

CVE-2025-52559 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-52559 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-52559?

CVE-2025-52559 primarily affects Zulip Zulip Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-52559?

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

Does CVE-2025-52559 have an EU (EUVD) identifier?

Yes. CVE-2025-52559 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19763.

When was CVE-2025-52559 published?

CVE-2025-52559 was published on 2025-07-02 and last updated on 2026-06-17.

CVE-2025-52559

CVE-2025-52559 is a medium-severity vulnerability in Zulip Zulip Server with a CVSS 3.x base score of 6.8. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-19763
Weakness: CWE-79
Affected product: Zulip Zulip Server
Published: 2025-07-02
Last modified: 2026-06-17

Description

Zulip is an open-source team chat application. From versions 2.0.0-rc1 to before 10.4 in Zulip Server, the /digest/ URL of a server shows a preview of what the email weekly digest would contain. This URL, though not the digest itself, contains a cross-site scripting (XSS) vulnerability in both topic names and channel names. This issue has been fixed in Zulip Server 10.4. A workaround for this issue involves denying access to /digest/.

Frequently asked questions

What is CVE-2025-52559?: Zulip is an open-source team chat application. From versions 2.0.0-rc1 to before 10.4 in Zulip Server, the /digest/ URL of a server shows a preview of what the email weekly digest would contain. This URL, though not the digest itself, contains a cross-site scripting (XSS) vulnerability in both topic names and channel names. This issue has been fixed in Zulip Server 10.4. A workaround for this issue involves denying access to /digest/.
How severe is CVE-2025-52559?: CVE-2025-52559 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-52559 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-52559?: CVE-2025-52559 primarily affects Zulip Zulip Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-52559?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-52559 have an EU (EUVD) identifier?: Yes. CVE-2025-52559 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19763.
When was CVE-2025-52559 published?: CVE-2025-52559 was published on 2025-07-02 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:zulip:zulip_server:*:*:*:*:*:*:*:*
cpe:2.3:a:zulip:zulip_server:2.0.0:rc1:*:*:*:*:*:*

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