How severe is CVE-2023-53976?

CVE-2023-53976 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-2023-53976 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-53976?

CVE-2023-53976 affects Mybb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-53976?

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

Does CVE-2023-53976 have an EU (EUVD) identifier?

Yes. CVE-2023-53976 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-60238.

When was CVE-2023-53976 published?

CVE-2023-53976 was published on 2025-12-22 and last updated on 2026-06-17.

CVE-2023-53976

CVE-2023-53976 is a medium-severity vulnerability in Mybb 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)
CVSS v4: 5.1
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-60238
Weakness: CWE-79
Affected product: Mybb
Published: 2025-12-22
Last modified: 2026-06-17

Description

myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the template management system that allows authenticated administrators to inject malicious scripts when creating new templates. Attackers can exploit this vulnerability by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface, causing arbitrary JavaScript to execute when the template is viewed.

Frequently asked questions

What is CVE-2023-53976?: myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the template management system that allows authenticated administrators to inject malicious scripts when creating new templates. Attackers can exploit this vulnerability by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface, causing arbitrary JavaScript to execute when the template is viewed.
How severe is CVE-2023-53976?: CVE-2023-53976 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-2023-53976 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-53976?: CVE-2023-53976 affects Mybb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-53976?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-53976 have an EU (EUVD) identifier?: Yes. CVE-2023-53976 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-60238.
When was CVE-2023-53976 published?: CVE-2023-53976 was published on 2025-12-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mybb:mybb:1.8.26:*:*:*:*:*:*:*

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