Vulnerability · Published Jul 2, 2025 · Assigned by GitHub_M

CVE-2025-52559Zulip XSS in digest preview URL

Medium 6.8

In plain English

A medium-severity cross-site scripting in zulip from zulip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.3%top 78.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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/.

Affected products (as reported)

Vendor	Product	Versions
zulip	zulip	>= 2.0.0-rc1, < 10.4

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

References

https://github.com/zulip/zulip/security/advisories/GHSA-vgf2-vw4r-m663 x_refsource_CONFIRM
https://github.com/zulip/zulip/commit/175ec1f365b0db982d6eac9019701cbf6e8bc2f2 x_refsource_MISC
https://github.com/zulip/zulip/commit/1a8429e338ff53bdcc4b42e7e71b6fffdd84fcd1 x_refsource_MISC
https://github.com/zulip/zulip/commit/6608c8777254e73a4b540e5e1c4af92e680a55fc x_refsource_MISC