How severe is CVE-2025-30342?

CVE-2025-30342 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-30342 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-30342?

CVE-2025-30342 affects Openslides. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-30342?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-30342 have an EU (EUVD) identifier?

Yes. CVE-2025-30342 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7271.

When was CVE-2025-30342 published?

CVE-2025-30342 was published on 2025-03-21 and last updated on 2026-06-17.

CVE-2025-30342

CVE-2025-30342 is a medium-severity vulnerability in Openslides with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-7271
Weakness: CWE-79
Affected product: Openslides
Published: 2025-03-21
Last modified: 2026-06-17

Description

An XSS issue was discovered in OpenSlides before 4.2.5. When submitting descriptions such as Moderator Notes or Agenda Topics, an editor is shown that allows one to format the submitted text. This allows insertion of various HTML elements. When trying to insert a SCRIPT element, it is properly encoded when reflected; however, adding attributes to links is possible, which allows the injection of JavaScript via the onmouseover attribute and others. When a user moves the mouse over such a prepared link, JavaScript is executed in that user's session.

Frequently asked questions

What is CVE-2025-30342?: An XSS issue was discovered in OpenSlides before 4.2.5. When submitting descriptions such as Moderator Notes or Agenda Topics, an editor is shown that allows one to format the submitted text. This allows insertion of various HTML elements. When trying to insert a SCRIPT element, it is properly encoded when reflected; however, adding attributes to links is possible, which allows the injection of JavaScript via the onmouseover attribute and others. When a user moves the mouse over such a prepared link, JavaScript is executed in that user's session.
How severe is CVE-2025-30342?: CVE-2025-30342 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-30342 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-30342?: CVE-2025-30342 affects Openslides. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-30342?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-30342 have an EU (EUVD) identifier?: Yes. CVE-2025-30342 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7271.
When was CVE-2025-30342 published?: CVE-2025-30342 was published on 2025-03-21 and last updated on 2026-06-17.

References

https://www.x41-dsec.de/lab/advisories/x41-2025-001-OpenSlides

Affected products (1)

cpe:2.3:a:openslides:openslides:*:*:*:*:*:*:*:*

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