How severe is CVE-2023-39991?

CVE-2023-39991 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2023-39991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-39991?

CVE-2023-39991 primarily affects Blindsidenetworks Bigbluebutton. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-39991?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-39991 published?

CVE-2023-39991 was published on 2023-09-04 and last updated on 2026-06-17.

CVE-2023-39991

CVE-2023-39991 is a high-severity vulnerability in Blindsidenetworks Bigbluebutton with a CVSS 3.x base score of 7.1. 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: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Blindsidenetworks Bigbluebutton
Published: 2023-09-04
Last modified: 2026-06-17

Description

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Blindside Networks BigBlueButton plugin <= 3.0.0-beta.4 versions.

Frequently asked questions

What is CVE-2023-39991?: Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Blindside Networks BigBlueButton plugin <= 3.0.0-beta.4 versions.
How severe is CVE-2023-39991?: CVE-2023-39991 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2023-39991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-39991?: CVE-2023-39991 primarily affects Blindsidenetworks Bigbluebutton. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-39991?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-39991 published?: CVE-2023-39991 was published on 2023-09-04 and last updated on 2026-06-17.

References

https://patchstack.com/database/vulnerability/bigbluebutton/wordpress-bigbluebutton-plugin-3-0-0-beta-4-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve

Affected products (5)

cpe:2.3:a:blindsidenetworks:bigbluebutton:*:*:*:*:*:wordpress:*:*
cpe:2.3:a:blindsidenetworks:bigbluebutton:3.0.0:beta1:*:*:*:wordpress:*:*
cpe:2.3:a:blindsidenetworks:bigbluebutton:3.0.0:beta2:*:*:*:wordpress:*:*
cpe:2.3:a:blindsidenetworks:bigbluebutton:3.0.0:beta3:*:*:*:wordpress:*:*
cpe:2.3:a:blindsidenetworks:bigbluebutton:3.0.0:beta4:*:*:*:wordpress:*:*

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