Security readout for executives and security teams
Plain-English summary
CVE-2026-1099 affects the Administrative Shortcodes WordPress plugin through version 0.3.4. A logged-in user with Contributor or higher permissions could place malicious script in certain shortcode attributes. That script may run when someone views the affected page, potentially exposing session data or enabling actions in the viewer’s browser.
Executive priority
Treat as a moderate-priority WordPress application risk. Prioritize sites with many content contributors, external authors, or high-value administrator accounts. No active exploitation is cited, but stored XSS can become serious if privileged users view injected content.
Technical view
The issue is stored cross-site scripting in the plugin’s 'login' and 'logout' shortcode attributes, caused by insufficient input sanitization and output escaping. It is classified as CWE-79 with CVSS 3.1 score 6.4. Exploitation requires authenticated Contributor-level access or higher, with script execution triggered when an injected page is accessed.
Likely exposure
WordPress sites using Administrative Shortcodes versions up to and including 0.3.4 are potentially exposed, especially if untrusted users have Contributor-level access or higher.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The attacker must already have an eligible WordPress account, but stored XSS can affect later page viewers, including privileged users.
Researcher notes
Evidence indicates vulnerable code paths in plugin source around the referenced shortcode handling. The provided bundle does not identify a fixed version. Avoid assuming patch availability; verify directly with WordPress plugin or vendor guidance before closing remediation.
Mitigation direction
- Identify sites using Administrative Shortcodes and confirm installed version.
- If version is 0.3.4 or earlier, check vendor guidance for an update or remediation.
- Temporarily disable or remove the plugin if business use is not required.
- Restrict Contributor-level access to trusted users only.
- Review content using 'login' and 'logout' shortcodes for suspicious attributes.
Validation and detection
- Inventory WordPress plugins across managed sites.
- Confirm whether Administrative Shortcodes is installed and at version 0.3.4 or earlier.
- Review pages and posts containing affected shortcodes.
- Audit users with Contributor, Author, Editor, or Administrator roles.
- Monitor for unexpected script execution reports on 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-2026-1099 mapping review
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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/de931a65-c898-4b1d-99ce-20dd646bcbb0?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/administrative-shortcodes/trunk/administrative-shortcodes.php#L196CVE reference
- https://plugins.trac.wordpress.org/browser/administrative-shortcodes/tags/0.3.4/administrative-shortcodes.php#L196CVE 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.