Vulnerability · Published May 30, 2023 · Assigned by GitHub_M

CVE-2023-33186Cross-site scripting vulnerability in Zulip Server development branch via topic tooltip

High 8.2

In plain English

A high-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 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.6%top 50.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. The main development branch of Zulip Server from May 2, 2023 and later, including beta versions 7.0-beta1 and 7.0-beta2, is vulnerable to a cross-site scripting vulnerability in tooltips on the message feed. An attacker who can send messages could maliciously craft a topic for the message, such that a victim who hovers the tooltip for that topic in their message feed triggers execution of JavaScript code controlled by the attacker.

Affected products (as reported)

Vendor	Product	Versions
zulip	zulip	>= 7.0-beta1, < 7.0-beta3

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

References

https://github.com/zulip/zulip/security/advisories/GHSA-4r83-8f94-hrph x_refsource_CONFIRM
https://github.com/zulip/zulip/pull/25370 x_refsource_MISC
https://github.com/zulip/zulip/commit/03cfb3d9fe61c975d133121ec31a7357f0c9e18f x_refsource_MISC
https://github.com/zulip/zulip/commit/3ca131743b00f42bad8edbac4ef92656d954c629 x_refsource_MISC