CVE-2024-36625Network attack vector

Script execution via unescaped emoji alt text

Published Nov 29, 2024 · Updated Nov 29, 2024

Cross-site scripting in Zulip 8.3 allows remote authenticated users to execute script in another user's browser via crafted emoji alt text. The replace_emoji_with_text function returns an image element's alt attribute to jQuery replaceWith, which interprets the string as HTML rather than text. Exploitation requires low-privileged access and user interaction, enabling script execution in the affected page's origin.

CVSS severity6.1
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Zulip 8.3 allows remote authenticated users to execute script in another user's browser via crafted emoji alt text. The replace_emoji_with_text function returns an image element's alt attribute to jQuery replaceWith, which interprets the string as HTML rather than text. Exploitation requires low-privileged access and user interaction, enabling script execution in the affected page's origin.

The record

CVE
CVE-2024-36625
Published
Nov 29, 2024
Updated
Nov 29, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 29, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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.

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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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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