CVE-2020-26287

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Summary

CVECVE-2020-26287
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-12-29 00:15:00 UTC
Updated2020-12-30 16:50:00 UTC
DescriptionHedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an attacker can inject arbitrary `script` tags in HedgeDoc notes using mermaid diagrams. Our content security policy prevents loading scripts from most locations, but `www.google-analytics.com` is allowed. Using Google Tag Manger it is possible to inject arbitrary JavaScript and execute it on page load. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.1. As a workaround one can disallow `www.google-analytics.com` in the `Content-Security-Policy` header. Note that other ways to leverage the `script` tag injection might exist.

Risk And Classification

Problem Types: CWE-79

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Hedgedoc Hedgedoc All All All All
Application Hedgedoc Hedgedoc All All All All

References

ReferenceSourceLinkTags
Stored XSS in mermaid · Issue #1630 · hackmdio/codimd · GitHub MISC github.com Third Party Advisory
Release HedgeDoc 1.7.1 · hedgedoc/hedgedoc · GitHub MISC github.com Third Party Advisory
ctf-writeups/solution.md at main · Alemmi/ctf-writeups · GitHub MISC github.com Exploit, Third Party Advisory
Stored XSS in mermaid diagrams · Advisory · hedgedoc/hedgedoc · GitHub CONFIRM github.com Third Party Advisory
Merge pull request from GHSA-g6w6-7xf9-m95p · hedgedoc/hedgedoc@58276eb · GitHub MISC github.com Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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