Security readout for executives and security teams
Plain-English summary
YaySMTP for WordPress allowed unsafe email content to be stored and later rendered as script. An outside attacker could potentially cause malicious JavaScript to run in the browser of someone viewing the affected page. For a business, the concern is account-session risk and trust impact on affected WordPress administration workflows.
Executive priority
Treat this as a high-priority WordPress plugin remediation item, especially on customer-facing or business-critical sites. The bundle does not prove exploitation, but unauthenticated stored XSS can create meaningful account and content-integrity risk if administrators view affected stored content.
Technical view
CVE-2023-3093 is stored cross-site scripting in YaySMTP versions up to and including 2.4.5, caused by insufficient input sanitization and output escaping of email contents. The CVSS 3.1 score is 7.2, network exploitable, low complexity, unauthenticated, with changed scope and low confidentiality and integrity impact.
Likely exposure
Exposure is likely limited to WordPress sites running YaySMTP at version 2.4.5 or earlier. Sites not using this plugin, or using versions beyond the affected range, are not indicated as exposed by the source bundle.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The risk comes from unauthenticated stored XSS: malicious script may execute when a user accesses a page containing stored email content.
Researcher notes
The provided data identifies CWE-79 and points to a WordPress.org changeset, but does not include detailed patch notes or exploit telemetry. Avoid assuming active exploitation. Validation should focus on plugin presence, version, exposed email-content rendering, and post-remediation review of stored content.
Mitigation direction
- Inventory WordPress sites for YaySMTP installations and installed versions.
- Update YaySMTP beyond version 2.4.5 where vendor guidance confirms a fixed release.
- Disable or remove the plugin if timely update is not possible.
- Restrict access to WordPress administration until remediation is complete.
- Review vendor and Wordfence guidance for any additional cleanup instructions.
Validation and detection
- Confirm whether YaySMTP is installed on each WordPress site.
- Record the installed plugin version and compare it to 2.4.5.
- Review WordPress users and sessions for suspicious administrative activity.
- Inspect plugin email-log views for unexpected script-like content.
- Verify remediation by confirming the plugin is updated or removed.
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-2023-3093 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
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:C/C:L/I:L/A:N3.92.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source materials
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.