CVE-2022-36048Network attack vector

IP address disclosure via remote-image proxy bypass

Published Aug 31, 2022 · Updated Apr 23, 2025

Information disclosure in Zulip Server before 5.6 allows remote authenticated users to obtain viewers' IP addresses via crafted image URLs. The remote-image URL handler accepts a crafted URL as directly embeddable instead of rewriting it through the configured go-camo proxy. The sender must be able to post a message and a recipient must display it; previews must be enabled, exposing the recipient's IP address and browser fingerprinting data.

CVSS severity4.3
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Zulip Server before 5.6 allows remote authenticated users to obtain viewers' IP addresses via crafted image URLs. The remote-image URL handler accepts a crafted URL as directly embeddable instead of rewriting it through the configured go-camo proxy. The sender must be able to post a message and a recipient must display it; previews must be enabled, exposing the recipient's IP address and browser fingerprinting data.

The record

CVE
CVE-2022-36048
Published
Aug 31, 2022
Updated
Apr 23, 2025
Vendor
Zulip
Product
Zulip
Classifications
CWE-436, T1592.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zulip · Zulipversion=< 5.6

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-436Interpretation Conflict
T1592.004Gather Victim Host Information: Client Configurations

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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