CVE-2025-52559 Zulip XSS in digest preview URL
Attackers can inject malicious scripts via topic or channel names in the digest preview URL, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-52559?
CVE-2025-52559 is a medium-severity cross-site scripting vulnerability in zulip, published on 2 Jul 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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/.
Weakness: CWE-79
Which versions are affected by CVE-2025-52559?
It affects 1 product.
Products include Zulip Zulip Server.
How do I fix CVE-2025-52559?
No fix has been published for CVE-2025-52559 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-52559 being exploited?
There is no known exploitation of CVE-2025-52559 in the wild and no public exploit code.
Other vulnerabilities in zulip
- CVE-2019-18933 Information disclosure in n/a
- CVE-2020-15070 Code injection in n/a
- CVE-2017-0910 Missing authorization in Zulip Server
- CVE-2025-31478 Zulip Authentication Backend Configuration Bypass
- CVE-2023-33186 Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip
Sources
Also known as GHSA-vgf2-vw4r-m663.