Backdrop CMS Core Unsafe SVG Upload Allows Client‑Side Script Execution
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
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| BackdropCMS | Backdrop | unaffected |
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| Backdropcms | Backdrop |
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Vendor Solution
Update your site to the most recent version of Backdrop core. Download available on the Backdrop CMS 1.35.2 release page https://github.com/backdrop/backdrop/releases/tag/1.35.6 . See the update instructions https://docs.backdropcms.org/documentation/core-updates .
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.234% probability within 30 days)
| Link | Providers |
|---|---|
| https://backdropcms.org/security/backdrop-sa-core-2026-007 |
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| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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| Type | Values Removed | Values Added |
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| Title | Backdrop CMS Core Unsafe SVG Upload Allows Client‑Side Script Execution |
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| First Time appeared |
Backdropcms
Backdropcms backdrop |
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| Weaknesses | CWE-79 | |
| CPEs | cpe:2.3:a:backdropcms:backdrop:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Backdropcms
Backdropcms backdrop |
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| References |
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| Metrics |
cvssV4_0
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