Security readout for executives and security teams
Plain-English summary
A WordPress plugin used for front-end post submissions has a stored cross-site scripting flaw. A logged-in user with Contributor-level access or higher could save malicious script through the plugin’s usp_access shortcode. That script may run when someone views the affected page.
Executive priority
Treat as a near-term WordPress hygiene issue, not an emergency based on available evidence. Prioritize sites with many content contributors, public registration, shared accounts, or sensitive user sessions. Patch or reduce contributor access promptly.
Technical view
CVE-2026-0913 affects User Submitted Posts – Enable Users to Submit Posts from the Front End through version 20260110. The issue is CWE-79 stored XSS caused by insufficient sanitization and output escaping of user-supplied shortcode attributes. CVSS 3.1 is 6.4: network exploitable, low complexity, low privileges required, no user interaction required by the attacker.
Likely exposure
Exposure is most likely on WordPress sites running this plugin at version 20260110 or earlier, especially where Contributor or higher accounts are broadly assigned, shared, or untrusted. Public-facing content increases business impact because injected scripts execute for page visitors.
Exploitation context
The source bundle does not indicate active exploitation, and KEV is false. Exploitation requires authenticated Contributor-level access or higher. Impact is limited to script execution in the browser context of users viewing an injected page, with potential confidentiality and integrity consequences.
Researcher notes
Evidence names versions through 20260110 and references the vulnerable shortcode file plus a WordPress.org changeset. The bundle does not clearly state the fixed release number. Avoid assuming exploitation in the wild without KEV or other cited confirmation.
Mitigation direction
- Check vendor and WordPress plugin guidance for a release newer than 20260110.
- Update the plugin if a fixed version is available from the official repository.
- Limit Contributor and higher roles to trusted users only.
- Review pages and posts using the usp_access shortcode.
- Remove suspicious shortcode attributes or unexpected embedded script content.
Validation and detection
- Inventory WordPress sites using User Submitted Posts.
- Identify plugin versions at or below 20260110.
- Review Contributor, Author, Editor, and Administrator account assignments.
- Search site content for usp_access shortcode usage.
- Confirm remediation against the vendor changeset or official release notes.
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 lookupCVE-2026-0913 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.
CVSS vector scores
1 official scoreWe 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:N3.12.7Primary CVE scoreVulnerability scoring details
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
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/85bf7a1b-3c54-40c9-8f19-fcb9dd478a0e?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/user-submitted-posts/tags/20251210/library/shortcode-access.php#L20CVE reference
- https://plugins.trac.wordpress.org/changeset/3439027/CVE reference
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.