EUVD-2026-42791
GHSA-rqrj-mfh4-2x3m
Severity by source
AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Aligns with NVD vector: AC:H captures non-default config requirement, PR:H reflects mandatory admin credentials, S:C reflects cross-user script execution, no availability impact.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
The WPvivid Backup for MainWP plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 0.9.33 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
AnalysisAI
Stored Cross-Site Scripting in the WPvivid Backup for MainWP WordPress plugin (all versions up to and including 0.9.33) allows authenticated administrators to inject persistent malicious scripts via plugin settings fields, which then execute in any user's browser upon visiting an affected page. Exploitation is constrained to WordPress multi-site environments or single-site installs where the unfiltered_html capability has been explicitly disabled, and requires an attacker to already hold administrator-level credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two simultaneous conditions: (1) the attacker holds an active WordPress account with administrator-level permissions or higher - the CVSS vector's PR:H confirms the highest privilege tier is required, and lower-privilege roles such as Editor or Subscriber cannot trigger this vulnerability; and (2) the target WordPress installation is either configured as a multi-site network OR has the unfiltered_html capability explicitly disabled for administrators - the description explicitly states this flaw does not affect standard single-site WordPress deployments with default capability settings. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS base score of 4.4 (Medium) is well-calibrated given the compounding constraints on exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained WordPress administrator credentials - through phishing, credential stuffing, or a prior compromise - navigates to the WPvivid Backup for MainWP plugin settings page on a qualifying multi-site or unfiltered_html-disabled WordPress installation and injects a JavaScript payload into an insufficiently sanitized settings field. The payload is persisted server-side, and any user who subsequently visits a page that renders this setting has the script execute in their browser, enabling session cookie theft or malicious redirects. … |
| Remediation | An upstream code fix has been committed to the WordPress plugin SVN repository (changeset 3047890, viewable at https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3047890%40wpvivid-backup-mainwp&new=3047890%40wpvivid-backup-mainwp); however, a specific named release version incorporating this commit has not been independently confirmed from the available data - update to the latest available version from the WordPress plugin directory and verify the installed version is newer than 0.9.33 by checking the plugin changelog before deployment. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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