CVE-2021-36845 (GCVE-0-2021-36845)

Vulnerability from cvelistv5 – Published: 2021-09-27 15:36 – Updated: 2026-04-28 16:07
VLAI
Title
YITH Maintenance Mode (WordPress plugin) <= 1.3.8 - Multiple Authenticated Stored Cross-Site Scripting (XSS) vulnerabilities
Summary
Multiple Authenticated Stored Cross-Site Scripting (XSS) vulnerabilities in YITH Maintenance Mode (WordPress plugin) versions <= 1.3.8, there are 46 vulnerable parameters that were missed by the vendor while patching the 1.3.7 version to 1.3.8. Vulnerable parameters: 1 - "Newsletter" tab, &yith_maintenance_newsletter_submit_label parameter: payload should start with a single quote (') symbol to break the context, i.e.: NOTIFY ME' autofocus onfocus=alert(/Visse/);// v=' - this payload will be auto triggered while admin visits this page/tab. 2 - "General" tab issues, vulnerable parameters: &yith_maintenance_message, &yith_maintenance_custom_style, &yith_maintenance_mascotte, &yith_maintenance_title_font[size], &yith_maintenance_title_font[family], &yith_maintenance_title_font[color], &yith_maintenance_paragraph_font[size], &yith_maintenance_paragraph_font[family], &yith_maintenance_paragraph_font[color], &yith_maintenance_border_top. 3 - "Background" tab issues, vulnerable parameters: &yith_maintenance_background_image, &yith_maintenance_background_color. 4 - "Logo" tab issues, vulnerable parameters: &yith_maintenance_logo_image, &yith_maintenance_logo_tagline, &yith_maintenance_logo_tagline_font[size], &yith_maintenance_logo_tagline_font[family], &yith_maintenance_logo_tagline_font[color]. 5 - "Newsletter" tab issues, vulnerable parameters: &yith_maintenance_newsletter_email_font[size], &yith_maintenance_newsletter_email_font[family], &yith_maintenance_newsletter_email_font[color], &yith_maintenance_newsletter_submit_font[size], &yith_maintenance_newsletter_submit_font[family], &yith_maintenance_newsletter_submit_font[color], &yith_maintenance_newsletter_submit_background, &yith_maintenance_newsletter_submit_background_hover, &yith_maintenance_newsletter_title, &yith_maintenance_newsletter_action, &yith_maintenance_newsletter_email_label, &yith_maintenance_newsletter_email_name, &yith_maintenance_newsletter_submit_label, &yith_maintenance_newsletter_hidden_fields. 6 - "Socials" tab issues, vulnerable parameters: &yith_maintenance_socials_facebook, &yith_maintenance_socials_twitter, &yith_maintenance_socials_gplus, &yith_maintenance_socials_youtube, &yith_maintenance_socials_rss, &yith_maintenance_socials_skype, &yith_maintenance_socials_email, &yith_maintenance_socials_behance, &yith_maintenance_socials_dribble, &yith_maintenance_socials_flickr, &yith_maintenance_socials_instagram, &yith_maintenance_socials_pinterest, &yith_maintenance_socials_tumblr, &yith_maintenance_socials_linkedin.
Severity
6.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-28 16:49 UTC
CWE
  • CWE-79 - Cross-site Scripting (XSS)
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3451 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
YITH YITH Maintenance Mode (WordPress plugin) Affected: <= 1.3.8 , ≤ 1.3.8 (custom)
guessed Create a notification for this product.
Date Public
2021-09-23 00:00
Credits
Original researcher - Vlad Visse (Patchstack), research based on previously reported vulnerability by Asif Nawaz Minhas (Patchstack Red Team)
Show details on NVD website
To clipboard 

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            "value": "M\u00faltiples vulnerabilidades de tipo Cross-Site Scripting (XSS) Almacenado y Autenticado en YITH Maintenance Mode (plugin de WordPress) versiones anteriores a 1.3.8 incluy\u00e9ndola, hay 46 par\u00e1metros vulnerables que fueron pasados por alto por el proveedor mientras parcheaba la versi\u00f3n 1.3.7 a la 1.3.8. Par\u00e1metros vulnerables: 1 - Pesta\u00f1a \"Newsletter\", par\u00e1metro \u0026amp;yith_maintenance_newsletter_submit_label: el payload debe comenzar con un s\u00edmbolo de comillas simples (\u0027) para romper el contexto, es decir: NOTIFY ME\u0027 autofocus onfocus=alert(/Visse/);// v=\u0027 - este payload se autodesencadenar\u00e1 mientras el administrador visite esta p\u00e1gina/pesta\u00f1a. 2 - Problemas de la pesta\u00f1a \"General\", par\u00e1metros vulnerables: \u0026amp;yith_maintenance_message, \u0026amp;yith_maintenance_custom_style, \u0026amp;yith_maintenance_mascotte, \u0026amp;yith_maintenance_title_font[size], \u0026amp;yith_maintenance_title_font[family], \u0026amp;yith_maintenance_title_font[color], \u0026amp;yith_maintenance_paragraph_font[size], \u0026amp;yith_maintenance_paragraph_font[family], \u0026amp;yith_maintenance_paragraph_font[color], \u0026amp;yith_maintenance_border_top. 3 - Problemas con la pesta\u00f1a \"Background\", par\u00e1metros vulnerables: \u0026amp;yith_maintenance_background_image, \u0026amp;yith_maintenance_background_color. 4 - Problemas con la pesta\u00f1a \"Logo\", par\u00e1metros vulnerables: \u0026amp;yith_maintenance_logo_image, \u0026amp;yith_maintenance_logo_tagline_font, \u0026amp;yith_maintenance_logo_tagline_font[size], \u0026amp;yith_maintenance_logo_tagline_font[family], \u0026amp;yith_maintenance_logo_tagline_font[color]. 5 - Problemas con la pesta\u00f1a \"Newsletter\", par\u00e1metros vulnerables: \u0026amp;yith_maintenance_newsletter_email_font[size], \u0026amp;yith_maintenance_newsletter_email_font[family], \u0026amp;yith_maintenance_newsletter_email_font[color], \u0026amp;yith_maintenance_newsletter_submit_font[size], \u0026amp;yith_maintenance_newsletter_submit_font[family], \u0026amp;yith_maintenance_newsletter_submit_font[color], \u0026amp;yith_maintenance_newsletter_submit_background, \u0026amp;yith_maintenance_newsletter_submit_background_hover, \u0026amp;yith_maintenance_newsletter_title, \u0026amp;yith_maintenance_newsletter_action, \u0026amp;yith_maintenance_newsletter_email_label, \u0026amp;yith_maintenance_newsletter_email_name, \u0026amp;yith_maintenance_newsletter_submit_label, \u0026amp;yith_maintenance_newsletter_hidden_fields. 6 - Problemas de la pesta\u00f1a \"Socials\", par\u00e1metros vulnerables: \u0026amp;yith_maintenance_socials_facebook, \u0026amp;yith_maintenance_socials_twitter, \u0026amp;yith_maintenance_socials_gplus, \u0026amp;yith_maintenance_socials_youtube, \u0026amp;yith_maintenance_socials_rss, \u0026amp;yith_maintenance_socials_skype, \u0026amp;yith_maintenance_socials_email, \u0026amp;yith_maintenance_socials_behance, \u0026amp;yith_maintenance_socials_dribble, \u0026amp;yith_maintenance_socials_flickr, \u0026amp;yith_maintenance_socials_instagram, \u0026amp;yith_maintenance_socials_pinterest, \u0026amp;yith_maintenance_socials_tumblr, \u0026amp;yith_maintenance_socials_linkedin"
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}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.