How severe is CVE-2026-28555?

CVE-2026-28555 has a CVSS 3.x base score of 4.3, 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 low, and availability none.

Is CVE-2026-28555 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28555?

CVE-2026-28555 affects Gvectors Wpforo Forum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28555?

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

Does CVE-2026-28555 have an EU (EUVD) identifier?

Yes. CVE-2026-28555 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9104.

When was CVE-2026-28555 published?

CVE-2026-28555 was published on 2026-02-28 and last updated on 2026-06-17.

CVE-2026-28555

CVE-2026-28555 is a medium-severity vulnerability in Gvectors Wpforo Forum with a CVSS 3.x base score of 4.3. 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 4.3)
CVSS v4: 5.3
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9104
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 authorization vulnerability that allows authenticated subscribers to close or reopen any forum topic via the wpforo_close_ajax handler. Attackers submit a valid nonce with an arbitrary topic ID to bypass the moderator permission requirement and disrupt forum discussions.

Frequently asked questions

What is CVE-2026-28555?: wpForo Forum 2.4.14 contains a missing authorization vulnerability that allows authenticated subscribers to close or reopen any forum topic via the wpforo_close_ajax handler. Attackers submit a valid nonce with an arbitrary topic ID to bypass the moderator permission requirement and disrupt forum discussions.
How severe is CVE-2026-28555?: CVE-2026-28555 has a CVSS 3.x base score of 4.3, 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 low, and availability none.
Is CVE-2026-28555 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28555?: CVE-2026-28555 affects Gvectors Wpforo Forum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28555?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-28555 have an EU (EUVD) identifier?: Yes. CVE-2026-28555 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9104.
When was CVE-2026-28555 published?: CVE-2026-28555 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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