Security readout for executives and security teams
Plain-English summary
This affects WordPress sites running the RSVPMaker Excel plugin version 1.1 or earlier. A crafted link could cause script to run in a visitor’s browser if they click it, potentially exposing limited session or page data or enabling unwanted actions in that user context.
Executive priority
Treat this as a moderate website risk, not a crisis. It deserves prompt cleanup on public WordPress properties, especially where administrators use the affected site. The main business concern is user-targeted script execution and possible trust damage from compromised page interactions.
Technical view
CVE-2021-38337 is reflected XSS in RSVPMaker Excel through reflected $_SERVER["PHP_SELF"] in phpexcel/PHPExcel/Shared/JAMA/docs/download.php. It is network-reachable, unauthenticated, low complexity, and requires user interaction. CVSS 3.1 is 6.1 with changed scope and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to WordPress environments with RSVPMaker Excel installed at version 1.1 or earlier. The vulnerable path is inside the bundled PHPExcel JAMA documentation file. Sites without this plugin, or with a confirmed non-affected version, are not indicated as affected.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. Exploitation would require convincing a user to open a crafted URL. Impact depends on the targeted user’s browser session and WordPress permissions, making administrator targeting more consequential.
Researcher notes
The evidence identifies reflected XSS and the affected plugin version range, but does not provide active exploitation proof. The WordPress Trac reference to version 1.2 should be reviewed as supporting code context, not assumed alone as full remediation guidance without vendor confirmation.
Mitigation direction
- Inventory WordPress sites for RSVPMaker Excel version 1.1 or earlier.
- Check Wordfence and vendor guidance for a confirmed fixed plugin version.
- Disable or remove the plugin if a safe version cannot be confirmed.
- Restrict public access to unused bundled documentation files where operationally safe.
- Prioritize administrator awareness of suspicious RSVPMaker Excel links.
Validation and detection
- Confirm whether RSVPMaker Excel is installed on each WordPress instance.
- Record the installed plugin version and compare it with affected version 1.1 or earlier.
- Check whether phpexcel/PHPExcel/Shared/JAMA/docs/download.php is publicly reachable.
- Review web logs for unusual requests to the vulnerable download.php path.
- Verify remediation by confirming the plugin is updated, removed, or access-restricted.
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-2021-38337 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38337CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/rsvpmaker-excel/tags/1.2/phpexcel/PHPExcel/Shared/JAMA/docs/download.php#L61CVE reference · x_refsource_MISC
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.