How severe is CVE-2025-4855?

CVE-2025-4855 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-4855 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4855?

CVE-2025-4855 affects Schiocco Support Board. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-4855?

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

Does CVE-2025-4855 have an EU (EUVD) identifier?

Yes. CVE-2025-4855 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20754.

When was CVE-2025-4855 published?

CVE-2025-4855 was published on 2025-07-09 and last updated on 2026-06-17.

CVE-2025-4855

CVE-2025-4855 is a critical-severity vulnerability in Schiocco Support Board with a CVSS 3.x base score of 9.8. 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-639.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-20754
Weakness: CWE-639
Affected product: Schiocco Support Board
Published: 2025-07-09
Last modified: 2026-06-17

Description

The Support Board plugin for WordPress is vulnerable to unauthorized access/modification/deletion of data due to use of hardcoded default secrets in the sb_encryption() function in all versions up to, and including, 3.8.0. This makes it possible for unauthenticated attackers to bypass authorization and execute arbitrary AJAX actions defined in the sb_ajax_execute() function. An attacker can use this vulnerability to exploit CVE-2025-4828 and various other functions unauthenticated.

Frequently asked questions

What is CVE-2025-4855?: The Support Board plugin for WordPress is vulnerable to unauthorized access/modification/deletion of data due to use of hardcoded default secrets in the sb_encryption() function in all versions up to, and including, 3.8.0. This makes it possible for unauthenticated attackers to bypass authorization and execute arbitrary AJAX actions defined in the sb_ajax_execute() function. An attacker can use this vulnerability to exploit CVE-2025-4828 and various other functions unauthenticated.
How severe is CVE-2025-4855?: CVE-2025-4855 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-4855 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4855?: CVE-2025-4855 affects Schiocco Support Board. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-4855?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-4855 have an EU (EUVD) identifier?: Yes. CVE-2025-4855 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20754.
When was CVE-2025-4855 published?: CVE-2025-4855 was published on 2025-07-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:schiocco:support_board:*:*:*:*:*:wordpress:*:*

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