CVE-2020-26286

Arbitary file upload

Description

HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an unauthenticated attacker can upload arbitrary files to the upload storage backend including HTML, JS and PHP files. The problem is patched in HedgeDoc 1.7.1. You should however verify that your uploaded file storage only contains files that are allowed, as uploaded files might still be served. As workaround it's possible to block the `/uploadimage` endpoint on your instance using your reverse proxy. And/or restrict MIME-types and file names served from your upload file storage.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.21% Top 25%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: hedgedoc hedgedoc
Published at:
Updated at:

References

Link Tags
https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-wcr3-xhv7-8gxc third party advisory
https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1 third party advisory
https://github.com/hedgedoc/hedgedoc/commit/e9306991cdb5ff2752c1eeba3fedba42aec3c2d8 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2020-26286?
CVE-2020-26286 has been scored as a high severity vulnerability.
How to fix CVE-2020-26286?
To fix CVE-2020-26286, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26286 being actively exploited in the wild?
It is possible that CVE-2020-26286 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-26286?
CVE-2020-26286 affects hedgedoc hedgedoc.
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