Security readout for executives and security teams
Plain-English summary
An authenticated WordPress user could abuse wpForo Forum role synchronization to change wpForo usergroup mappings in bulk. This can undermine forum permissions and potentially grant unintended privileges inside affected sites. The sources rate this high severity, but do not show confirmed active exploitation.
Executive priority
Treat this as a high-priority WordPress plugin exposure where authenticated users exist. Prioritize internet-facing community or customer portals first, especially those allowing self-registration or large user bases.
Technical view
CVE-2026-28557 is a CWE-862 missing capability check in wpForo Forum 2.4.14, involving the wpforo_synch_roles AJAX role synchronization handler. The reported impact is high integrity compromise through arbitrary WordPress role-to-wpForo usergroup remapping by authenticated users.
Likely exposure
Exposure is most relevant to WordPress sites using wpForo Forum, especially version 2.4.14. Risk increases where untrusted or broadly registered users can authenticate. The source bundle lists versions 2.4 and 2.4.16 but does not clearly define a full affected range.
Exploitation context
The source bundle describes authenticated, low-privilege exploitation with no user interaction. KEV is false, and the provided sources do not claim active exploitation in the wild. The advisory indicates abuse depends on accessing plugin administrative functionality and triggering role synchronization logic.
Researcher notes
The core issue is authorization failure on a sensitive synchronization handler. Sources identify high integrity impact but provide limited patch detail and no KEV confirmation. Validate exact affected and fixed versions from the plugin changelog before asserting remediation completeness.
Mitigation direction
- Check wpForo Forum vendor guidance and changelog for the corrected version.
- Upgrade wpForo Forum according to confirmed vendor guidance.
- Restrict WordPress account creation and access for untrusted users.
- Review wpForo usergroup mappings for unexpected role assignments.
- Temporarily disable wpForo where risk outweighs business need.
Validation and detection
- Inventory WordPress sites running wpForo Forum.
- Confirm installed wpForo Forum versions against vendor guidance.
- Review wpForo usergroup-to-role mappings for unauthorized changes.
- Check WordPress admin and plugin activity logs for role synchronization events.
- Confirm only trusted administrators can manage forum usergroups.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-28557 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N2.83.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- wpForo Forum WordPress PluginCVE reference, VulnCheck · product, patch
- VulnCheck Advisory: wpForo Forum 2.4.14 Privilege Escalation via Role Synchronization HandlerCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.