How severe is CVE-2026-28557?

CVE-2026-28557 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-28557 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28557?

CVE-2026-28557 affects Gvectors Wpforo Forum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28557?

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

Does CVE-2026-28557 have an EU (EUVD) identifier?

Yes. CVE-2026-28557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9106.

When was CVE-2026-28557 published?

CVE-2026-28557 was published on 2026-02-28 and last updated on 2026-06-17.

CVE-2026-28557

CVE-2026-28557 is a medium-severity vulnerability in Gvectors Wpforo Forum with a CVSS 3.x base score of 6.5. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9106
Weakness: CWE-862
Affected product: Gvectors Wpforo Forum
Published: 2026-02-28
Last modified: 2026-06-17

Description

wpForo Forum 2.4.14 contains a missing capability check vulnerability that allows authenticated users to trigger bulk wpForo usergroup reassignment via the wpforo_synch_roles AJAX handler. Attackers access the usergroups admin page, accessible to any authenticated user, to obtain a nonce, then remap all wpForo usergroups to arbitrary WordPress roles.

Frequently asked questions

What is CVE-2026-28557?: wpForo Forum 2.4.14 contains a missing capability check vulnerability that allows authenticated users to trigger bulk wpForo usergroup reassignment via the wpforo_synch_roles AJAX handler. Attackers access the usergroups admin page, accessible to any authenticated user, to obtain a nonce, then remap all wpForo usergroups to arbitrary WordPress roles.
How severe is CVE-2026-28557?: CVE-2026-28557 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-28557 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28557?: CVE-2026-28557 affects Gvectors Wpforo Forum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28557?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-28557 have an EU (EUVD) identifier?: Yes. CVE-2026-28557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9106.
When was CVE-2026-28557 published?: CVE-2026-28557 was published on 2026-02-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:gvectors:wpforo_forum:*:*:*:*:*:wordpress:*:*

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