CVE-2025-30342Public exploitNetwork attack vector

Stored XSS via unsanitized link event attributes

Published Mar 21, 2025 · Updated Mar 21, 2025

Stored XSS in formatted descriptions in Intevation OpenSlides before 4.2.5 allows remote authenticated users to run JavaScript. The rich-text editor accepts event-handler attributes such as onmouseover on links even though it encodes script elements when reflecting content. An authenticated user must save crafted content and another user must hover over its link, executing code in the victim's session with limited confidentiality and integrity impact.

CVSS severity5.4
Medium
EPSS probability0.25%
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 formatted descriptions in Intevation OpenSlides before 4.2.5 allows remote authenticated users to run JavaScript. The rich-text editor accepts event-handler attributes such as onmouseover on links even though it encodes script elements when reflecting content. An authenticated user must save crafted content and another user must hover over its link, executing code in the victim's session with limited confidentiality and integrity impact.

The record

CVE
CVE-2025-30342
Published
Mar 21, 2025
Updated
Mar 21, 2025
Vendor
Intevation
Product
OpenSlides
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <4.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Intevation · OpenSlidesversion=0 <4.2.5

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.5X41 D-SecCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
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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