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CVE-2026-111442

Quick assessment

Affected
BackdropCMS Backdrop
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.

Backdrop CMS 核心版本 1.35.x（1.35.2 之前）以及 1.34.x（1.34.6 之前）在上传的 SVG 图像验证方面存在不足，未能充分检测并阻止其中可能包含的危险 SVG 标签。由于 SVG 图像中可能包含可点击的链接或可执行的脚本，攻击者通过上传精心构造的 SVG 文件，可在用户直接查看该 SVG 图像时触发脚本执行。 该漏洞的影响受到以下因素的限制：攻击者必须具备上传 SVG 图像的能力；此外，Backdrop 会将所有上传的 SVG 图像嵌入到 HTML 的 标签中，从而阻止脚本在常规

CVSS 5.3 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 2 AI

T1059.007 · JavaScript T1203.002

Affected Version Matrix 2

VendorProduct Version RangeStatus
BackdropCMS Backdrop 1.35.0< 1.35.2 affected
1.34.0< 1.34.6 affected
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I. Basic Information for CVE-2026-111442

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Backdrop CMS Core 1.35.x before 1.35.2 and 1.34.x before 1.34.6 does not sufficiently validate uploaded SVG images to ensure they lack potentially dangerous SVG tags. SVG images can contain clickable links or executable scripting. By uploading a crafted SVG, it is possible to execute scripting in the browser when an SVG image is viewed. This issue is mitigated by the attacker needing to be able to upload SVG images, and that Backdrop embeds all uploaded SVG images within <img> tags, which prevents script from executing. The SVG must be viewed directly by its URL in order to run any embedded scripting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
BackdropCMS Backdrop 1.35.0 ~ 1.35.2 -

II. Public POCs for CVE-2026-111442

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III. Intelligence Information for CVE-2026-111442

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Vendor Advisories for CVE-2026-111442 (1)

IV. Related Vulnerabilities

Same product: Backdrop
Same vendor: BackdropCMS
Same weakness: CWE-79

V. Comments for CVE-2026-111442

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