Security readout for executives and security teams
Plain-English summary
A WordPress plugin called myCred has a stored cross-site scripting flaw. A logged-in user with Contributor-level access or higher could place malicious script through a coupon shortcode. That script can run when others view the affected page, potentially exposing session data or altering page behavior.
Executive priority
Treat this as a routine but time-sensitive WordPress plugin update and access-control issue. It is not presented as actively exploited, but sites with many content contributors have higher practical risk.
Technical view
CVE-2026-0550 is CWE-79 stored XSS in myCred’s `mycred_load_coupon` shortcode, affecting versions up to and including 2.9.7.3. The issue is insufficient sanitization and output escaping of user-supplied shortcode attributes. CVSS 3.1 is 6.4, with low privileges required and changed scope.
Likely exposure
Exposure is limited to WordPress sites running myCred versions up to 2.9.7.3 where untrusted or semi-trusted users have Contributor or higher access and can create content using the affected shortcode.
Exploitation context
The sources do not report active exploitation, and it is not listed as CISA KEV in the provided bundle. Exploitation requires an authenticated account with content creation permissions, but successful injection can affect later page viewers.
Researcher notes
The public record attributes the issue to shortcode attribute handling in `addons/coupons/includes/mycred-coupon-shortcodes.php`. The WordPress Trac changeset is relevant for code review, but the provided sources do not clearly state a fixed version.
Mitigation direction
- Inventory WordPress sites using the myCred plugin.
- Check installed myCred versions against 2.9.7.3 and below.
- Review vendor or WordPress plugin guidance for the fixed release.
- Update myCred when an official patched version is available.
- Limit Contributor-level access to trusted users only.
- Review existing content using the `mycred_load_coupon` shortcode.
Validation and detection
- Confirm whether myCred is installed and active.
- Record the installed plugin version from WordPress administration or asset inventory.
- Identify users with Contributor, Author, Editor, or Administrator roles.
- Search site content for use of the affected coupon shortcode.
- Review relevant pages for unexpected script behavior or unauthorized edits.
- Monitor WordPress logs for suspicious authenticated content changes.
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-2026-0550 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
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.