CVE-2022-31017

low-risk

Published 2022-06-25

Zulip is an open-source team collaboration tool. Versions 2.1.0 through and including 5.2 are vulnerable to a logic error. A stream configured as private with protected history, where new subscribers should not be allowed to see messages sent before they were subscribed, when edited causes the server to incorrectly send an API event that includes the edited message to all of the stream’s current subscribers. This API event is ignored by official clients, but can be observed by using a modified client or the browser’s developer tools. This bug will be fixed in Zulip Server 5.3. There are no known workarounds.

Do I need to act?

0.18% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 2.0/10 Low

NETWORK / HIGH complexity

Affected Products (1)

Zulip

Affected Vendors

Zulip

References (2)

Third Party Advisory https://github.com/zulip/zulip/security/advisories/GHSA-m5j3-jp59-6f3q

/ 100

low-risk

Severity 8/34 · Low

Exploitability 1/34 · Minimal

Exposure 5/34 · Minimal