Security readout for executives and security teams
Plain-English summary
CVE-2026-1889 affects the Outgrow WordPress plugin through version 2.1. A logged-in user with Contributor-level access or higher could save malicious script content through an Outgrow shortcode attribute. That script may run when someone views the affected page. This is mainly a site-integrity and account-risk issue, not a server takeover finding.
Executive priority
Treat as a routine but timely WordPress remediation item. Prioritize sites with many content contributors, external authors, or sensitive admin sessions. The business risk is user/session compromise and site defacement through stored script execution, not direct infrastructure compromise based on current sources.
Technical view
The vulnerability is stored cross-site scripting in the Outgrow shortcode id attribute, caused by insufficient input sanitization and output escaping. The CVSS 3.1 score is 6.4, with low privileges required and changed scope. Public references point to newOutgrow.php around line 87 in trunk and version 2.1.
Likely exposure
Exposure is limited to WordPress sites using the Outgrow plugin through version 2.1, especially where Contributor or higher accounts are available to untrusted users. Sites without the plugin, without affected versions, or without lower-privileged content authors are less exposed.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires authenticated access with Contributor-level privileges or higher and a page or post where the affected shortcode can be saved and later viewed.
Researcher notes
Evidence is consistent with authenticated stored XSS via shortcode attribute handling. The provided affected metadata appears incomplete, but the description and Wordfence reference state all versions up to and including 2.1. No public source in the bundle confirms exploitation in the wild or a specific fixed version.
Mitigation direction
- Check WordPress and vendor guidance for a fixed Outgrow release or official remediation.
- Update the Outgrow plugin if a patched version is available from the vendor.
- Disable or remove the plugin if it is unnecessary or no fix is available.
- Restrict Contributor and higher access to trusted users only.
- Review existing pages and posts using the Outgrow shortcode.
Validation and detection
- Inventory WordPress sites for the Outgrow plugin.
- Confirm whether installed versions are 2.1 or earlier.
- Review content containing the outgrow shortcode id attribute.
- Check whether untrusted users have Contributor or higher roles.
- Monitor for unexpected scripts or edits in affected pages.
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-2026-1889 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/29e9ad80-6a02-494a-9d53-0f14728952aa?source=cveCVE reference
- https://wordpress.org/plugins/outgrow/CVE reference
- https://plugins.trac.wordpress.org/browser/outgrow/trunk/newOutgrow.php#L87CVE reference
- https://plugins.trac.wordpress.org/browser/outgrow/tags/2.1/newOutgrow.php#L87CVE 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.