Medium
Bypassing height value allowed in some theme components
Type: advisorySources: OSV
Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, some theme components allow users to add svgs with unlimited `height` attributes, and this can affect the availability of subsequent replies in a topic. Most Discourse instances are unaffected, only instances with the svgbob or the mermaid theme component are within scope. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches. As a workaround, disable or remove the relevant theme components.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-46130
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 18:19 UTC · Revision 1
Source evidence
Bypassing height value allowed in some theme components
core-osv · Original sourcePublished 10 Nov 2023, 14:54 UTC
Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, some theme components allow users to add svgs with unlimited `height` attributes, and this can affect the availability of subsequent replies in a topic. Most Discourse instances are unaffected, only instances with the svgbob or the mermaid theme component are within scope. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches. As a workaround, disable or remove the relevant theme components.
osv:CVE-2023-46130
Complete source record
{
"id": "6a9eaa2d00408331cf7f19e0ee8af5870042324c6a20e775ef2684c9d9d62423",
"url": "https://osv.dev/vulnerability/CVE-2023-46130",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Bypassing height value allowed in some theme components",
"summary": "Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, some theme components allow users to add svgs with unlimited `height` attributes, and this can affect the availability of subsequent replies in a topic. Most Discourse instances are unaffected, only instances with the svgbob or the mermaid theme component are within scope. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches. As a workaround, disable or remove the relevant theme components.",
"evidence": "osv:CVE-2023-46130",
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"CVE-2023-46130",
"GHSA-c876-638r-vfcg"
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"metrics": [
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"type": "CVSS_V3",
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"modified": "2026-10-28T02:30:44.743045919Z",
"provider": "osv",
"references": [
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"https://github.com/discourse/discourse/security/advisories/GHSA-c876-638r-vfcg",
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}