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CVE-2021-32681— Improper escaping of HTML ('Cross-site Scripting') in Wagtail StreamField blocks

Quick assessment

Affected
wagtail wagtail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Torchbox Wagtail是英国Torchbox公司的一套开源的内容管理系统（CMS）。 Wagtail 存在跨站脚本漏洞，该漏洞源于标签输出不能正确转义为HTML。这允许用户插入任意HTML或脚本。

CVSS 5.4 · Medium EPSS 1.11% · P66

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-32681

Vulnerability Information
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Vulnerability Title
Improper escaping of HTML ('Cross-site Scripting') in Wagtail StreamField blocks
Source: CVE Program / CVE List V5
Vulnerability Description
Wagtail is an open source content management system built on Django. A cross-site scripting vulnerability exists in versions 2.13-2.13.1, versions 2.12-2.12.4, and versions prior to 2.11.8. When the `{% include_block %}` template tag is used to output the value of a plain-text StreamField block (`CharBlock`, `TextBlock` or a similar user-defined block derived from `FieldBlock`), and that block does not specify a template for rendering, the tag output is not properly escaped as HTML. This could allow users to insert arbitrary HTML or scripting. This vulnerability is only exploitable by users with the ability to author StreamField content (i.e. users with 'editor' access to the Wagtail admin). Patched versions have been released as Wagtail 2.11.8 (for the LTS 2.11 branch), Wagtail 2.12.5, and Wagtail 2.13.2 (for the current 2.13 branch). As a workaround, site implementors who are unable to upgrade to a current supported version should audit their use of `{% include_block %}` to ensure it is not used to output `CharBlock` / `TextBlock` values with no associated template. Note that this only applies where `{% include_block %}` is used directly on that block (uses of `include_block` on a block _containing_ a CharBlock / TextBlock, such as a StructBlock, are unaffected). In these cases, the tag can be replaced with Django's `{{ ... }}` syntax - e.g. `{% include_block my_title_block %}` becomes `{{ my_title_block }}`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Torchbox Wagtail 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Torchbox Wagtail是英国Torchbox公司的一套开源的内容管理系统（CMS）。 Wagtail 存在跨站脚本漏洞，该漏洞源于标签输出不能正确转义为HTML。这允许用户插入任意HTML或脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wagtail wagtail < 2.11.8 -

II. Public POCs for CVE-2021-32681

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III. Intelligence Information for CVE-2021-32681

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Other References for CVE-2021-32681 (2)

IV. Related Vulnerabilities

Same product: wagtail
Same vendor: wagtail
Same weakness: CWE-79

V. Comments for CVE-2021-32681

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