Security readout for executives and security teams
Plain-English summary
CVE-2026-28558 affects the wpForo Forum WordPress plugin. An authenticated subscriber can upload a malicious SVG as an avatar, causing script execution when another user views the attacker’s profile. This can expose session-related data or alter page content, but the provided sources do not show active exploitation.
Executive priority
Treat this as a moderate-priority web application risk. Prioritize externally facing forums, communities with open registration, and sites where administrators may view user profiles while logged in. The issue is not listed as KEV in the provided bundle, but stored XSS can still create account and trust risks.
Technical view
The issue is stored XSS in wpForo Forum avatar upload handling. The bundle describes SVG avatars containing CSS injection or JavaScript event handlers that execute on profile page views. CVSS 3.1 is 6.4 with low privileges required, network access, no user interaction by the attacker, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is likely limited to WordPress sites running wpForo Forum versions identified by the sources, especially 2.4.14. Sites allowing subscriber registration or many low-privileged accounts have higher practical risk because exploitation requires an authenticated subscriber account.
Exploitation context
The source bundle states the attacker must be an authenticated subscriber and upload a crafted SVG avatar. Execution occurs when users view the attacker’s profile page. CISA KEV status is false in the bundle, and no cited source here confirms active exploitation.
Researcher notes
The provided evidence identifies stored XSS via SVG avatar upload in wpForo Forum 2.4.14, with affected-version metadata also listing 2.4 and 2.4.16. Exact fixed-version details are not fully stated in the bundle, so remediation should be tied to vendor changelog confirmation.
Mitigation direction
- Check vendor wpForo guidance and changelog for the fixed version.
- Upgrade wpForo Forum when the vendor-confirmed fix is available.
- Temporarily block or restrict SVG avatar uploads.
- Remove untrusted SVG avatars from existing user profiles.
- Limit subscriber registration if public signup is not required.
Validation and detection
- Inventory WordPress sites using the wpForo Forum plugin.
- Confirm deployed wpForo versions against the CVE and vendor pages.
- Review whether subscribers can upload SVG avatar files.
- Inspect existing user avatars for SVG files from untrusted accounts.
- Check logs for recent avatar uploads by low-privileged users.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-28558 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
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A: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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
5.1MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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 Stored XSS via SVG Avatar File UploadCVE 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.