CVE-2025-55133Public exploitNetwork attack vector

Stored XSS via unsafe topic name rendering

Published Aug 7, 2025 · Updated Aug 8, 2025

Stored XSS in Agora fall23-Alpha1 and earlier allows remote authenticated users to execute JavaScript through a crafted topic name. The topic tab renderer assigns topicName to a span's innerHTML property, causing stored markup to execute when another user visits the workspace. Workspace access and permission to set a topic name are required; injected script runs in another user's browser and can read or alter accessible page data.

CVSS severity6.4
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Agora fall23-Alpha1 and earlier allows remote authenticated users to execute JavaScript through a crafted topic name. The topic tab renderer assigns topicName to a span's innerHTML property, causing stored markup to execute when another user visits the workspace. Workspace access and permission to set a topic name are required; injected script runs in another user's browser and can read or alter accessible page data.

The record

CVE
CVE-2025-55133
Published
Aug 7, 2025
Updated
Aug 8, 2025
Vendor
Agora Foundation
Product
Agora
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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=0 <b087490042cb131963b524d0f86511a63a7ff085

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Agora Foundation · Agoraversion=0 <b087490042cb131963b524d0f86511a63a7ff085

Published CVSS scores

6.4MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/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.

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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

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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