Security readout for executives and security teams
Plain-English summary
CVE-2026-28559 lets unauthenticated visitors see forum topics that should remain private or unapproved through wpForo Forum's global RSS feed. The business risk is unintended disclosure of restricted community content, drafts, moderation queues, or sensitive discussions exposed through a public WordPress plugin feature.
Executive priority
Treat this as a moderate-priority confidentiality issue. It is not reported as actively exploited, but unauthenticated access and possible exposure of private forum content justify prompt inventory, vendor guidance review, and remediation for affected sites.
Technical view
The issue is CWE-200 information disclosure in wpForo Forum. Sources state privacy and status filters are applied only when a forum ID is present, so the global RSS feed path can return private and unapproved topics. The bundle names version 2.4.14 and affected metadata lists 2.4 and 2.4.16.
Likely exposure
Exposure is likely limited to WordPress sites running wpForo Forum versions identified in the sources, especially sites using private forums, moderated topics, or unapproved content. Public-only forums have lower data sensitivity, but should still validate behavior.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle, and no cited source states active exploitation. The described access requires no authentication, privileges, or user interaction, so internet-facing forums are the primary concern.
Researcher notes
Evidence is source-limited. The bundle clearly describes the flawed global RSS feed query behavior, but does not provide a definitive fixed version. The affected-version metadata and description differ, so researchers should verify installed versions and compare vendor changelog details before closing exposure.
Mitigation direction
- Identify all WordPress sites using wpForo Forum.
- Confirm installed wpForo Forum versions against vendor and CVE guidance.
- Review the wpForo developers page for a fixed version or advisory.
- Upgrade if the vendor identifies a corrected release.
- Temporarily restrict RSS access if private forum content may be exposed.
- Review exposed private or unapproved topics for disclosure impact.
Validation and detection
- Inventory wpForo Forum versions across production and staging WordPress sites.
- Check whether private forums or unapproved topics exist on affected sites.
- Review web logs for unauthenticated RSS feed access patterns.
- In staging, verify RSS output respects forum privacy and approval status.
- Confirm remediation by repeating privacy checks after upgrade or configuration changes.
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-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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 lookupCVE-2026-28559 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
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/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:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4VulnCheckVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 Information Disclosure via Global RSS FeedCVE 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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.