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CVE-2022-23656

Cross-site scripting vulnerability in Zulip Server

MEDIUM
5.4
CVSS Score
Published: March 2, 2022 at 08:25 PM UTC
Updated: June 17, 2026 at 04:30 AM UTC
2 products affected across 1 vendorZulip ServerZulip

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

Zulip is an open source team chat app. The `main` development branch of Zulip Server from June 2021 and later is vulnerable to a cross-site scripting vulnerability on the recent topics page. An attacker could maliciously craft a full name for their account and send messages to a topic with several participants; a victim who then opens an overflow tooltip including this full name on the recent topics page could trigger execution of JavaScript code controlled by the attacker. Users running a Zulip server from the main branch should upgrade from main (2022-03-01 or later) again to deploy this fix.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zulip Server· Zulip
95%
2021-06-03 ≤ v < 2022-03-01
Affected range stops below 2022-03-01, so it looks safe — our inference, not a vendor statement
Zulip· Zulip
60%
v < 2022-3-1
Affected range stops below 2022-3-1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/zulip/zulip/commit/e090027adcbf62737d5b1f83a9618a9500a49321
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/zulip/zulip/security/advisories/GHSA-fc77-h3jc-6mfv

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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