CVE-2024-35591Public exploitNetwork attack vector

Stored XSS via unsanitized attachment preview

Published May 24, 2024 · Updated Feb 13, 2025

Stored XSS in O2OA 8.3.8 allows remote authenticated users to run script in another user's browser through a crafted attachment preview. The upload and online-preview paths accept PDF or HTML content without effective filtering or escaping, so embedded JavaScript executes when the attachment is previewed. An attacker must log in, publish or circulate the attachment, and induce another user to preview it; demonstrated effects are confined to that user's browser session.

CVSS severity5.4
Medium
EPSS probability0.43%
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 O2OA 8.3.8 allows remote authenticated users to run script in another user's browser through a crafted attachment preview. The upload and online-preview paths accept PDF or HTML content without effective filtering or escaping, so embedded JavaScript executes when the attachment is previewed. An attacker must log in, publish or circulate the attachment, and induce another user to preview it; demonstrated effects are confined to that user's browser session.

The record

CVE
CVE-2024-35591
Published
May 24, 2024
Updated
Feb 13, 2025
Vendor
Zhejiang Zoneland Zongheng Network Technology Co., Ltd.
Product
O2OA
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=8.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zhejiang Zoneland Zongheng Network Technology Co., Ltd. · O2OAversion=8.3.8

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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