Security readout for executives and security teams
Plain-English summary
CVE-2026-1899 affects the Any Post Slider WordPress plugin through version 1.0.4. A logged-in user with Contributor-level access or higher can store malicious script in a shortcode attribute. That script can run when someone views the affected page. This is most concerning for sites allowing untrusted or many content contributors.
Executive priority
Treat as a near-term website hygiene issue, not an emergency based on current evidence. Prioritize sites with public registration, many contributors, or sensitive administrator sessions. If no update is available, reduce contributor access or disable the plugin until vendor guidance is clear.
Technical view
The flaw is stored cross-site scripting in the aps_slider shortcode, specifically the post_type attribute. The reported cause is insufficient input sanitization and output escaping. CVSS 3.1 is 6.4, with low privileges required, network attack vector, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to WordPress sites using Any Post Slider version 1.0.4 or earlier, especially where Contributor or higher accounts are available to untrusted users. Sites without this plugin, without vulnerable versions, or without such accounts have materially lower exposure.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. Exploitation requires authenticated WordPress access at Contributor level or above and an opportunity to create or edit content containing the vulnerable shortcode.
Researcher notes
The source bundle identifies CWE-79 and the vulnerable shortcode attribute. It does not name a fixed release or provide evidence of exploitation in the wild. Validate by version inventory and code review focused on sanitization and escaping around the post_type attribute output path.
Mitigation direction
- Check the WordPress plugin page and vendor guidance for a fixed version or advisory.
- Update Any Post Slider if a newer fixed version is available.
- Disable or remove the plugin if it is unnecessary.
- Restrict Contributor and higher roles to trusted users only.
- Review pages or posts using the aps_slider shortcode for suspicious attributes.
Validation and detection
- Inventory WordPress sites for the Any Post Slider plugin.
- Confirm installed plugin versions and flag 1.0.4 or earlier.
- Identify users with Contributor, Author, Editor, or Administrator roles.
- Search published and draft content for aps_slider shortcode usage.
- Review web application logs for suspicious edits by low-privileged accounts.
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-2026-1899 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/562f194f-1f32-4de4-8074-84580f653bdb?source=cveCVE reference
- https://wordpress.org/plugins/any-post-sliderCVE reference
- https://plugins.trac.wordpress.org/browser/any-post-slider/trunk/public/partials/any-post-slider-no_content.php#L3CVE reference
- https://plugins.trac.wordpress.org/browser/any-post-slider/tags/1.0.4/public/partials/any-post-slider-no_content.php#L3CVE 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.