Security readout for executives and security teams
Plain-English summary
CVE-2021-38357 is a reflected cross-site scripting issue in the SMS OVH WordPress plugin version 0.1 and earlier. An attacker could cause script to run in a victim's browser if the victim follows a crafted request. Business impact is mainly account/session abuse or content manipulation, not direct server takeover.
Executive priority
Handle as a moderate web application risk. It is not confirmed as actively exploited, but exposed WordPress sites can create user-trust and admin-session risk. Prioritize remediation where privileged users may click links or manage site content.
Technical view
The source bundle identifies CWE-79 reflected XSS in SMS OVH through the position parameter in sms-ovh-sent.php. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges required, user interaction required, scope changed, with low confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure is limited to WordPress sites with the SMS OVH plugin installed at version 0.1 or earlier. The bundle does not identify other affected products, CPEs, hosting providers, or a confirmed patched version.
Exploitation context
The CVE is not listed as KEV in the provided bundle, and no cited source claims active exploitation. Exploitation requires user interaction, consistent with reflected XSS. Treat public WordPress sites with this plugin as potentially reachable until inventory confirms otherwise.
Researcher notes
Evidence is concise and points to reflected XSS in one plugin file and parameter. The bundle does not provide a patch reference, exploit-in-the-wild evidence, or affected-version range beyond up to and including 0.1. Avoid broader product claims.
Mitigation direction
- Inventory WordPress sites for the SMS OVH plugin and installed version.
- Disable or remove SMS OVH if no safe vendor update is available.
- Check Wordfence and WordPress plugin guidance for any maintained fixed release.
- Prioritize sites used by administrators or high-privilege content editors.
- Use existing WAF/browser controls as interim risk reduction where applicable.
Validation and detection
- Confirm whether SMS OVH version 0.1 or earlier is present.
- Verify sms-ovh-sent.php is no longer reachable after removal or disablement.
- Review web logs for unusual requests involving sms-ovh-sent.php and position.
- Confirm any remediation through plugin inventory, not only file presence.
- Document affected sites, remediation date, and remaining exceptions.
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-2021-38357 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-2021-38357CVE reference · x_refsource_MISC
- https://plugins.trac.wordpress.org/browser/sms-ovh/trunk/sms-ovh-sent.php#L44CVE 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.