XSS in Hedgedoc
CVE-2021-39175
HedgeDoc is a platform to write and share markdown. In versions prior to 1.9.0, an unauthenticated attacker can inject arbitrary JavaScript into the speaker-notes of the slide-mode feature by embedding an iframe hosting the malicious code into the slides or by embedding the HedgeDoc instance into another page. The problem is patched in version 1.9.0. There are no known workarounds aside from upgrading.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Hedgedoc — versions < 1.9.0
Weakness classification (CWE)
References
- github.com/hedgedoc/hedgedoc/security/advisories/GHSA-j748-779h-9697 (Patch, Third Party Advisory)
- github.com/hedgedoc/hedgedoc/pull/1369 (Patch, Third Party Advisory)
- github.com/hedgedoc/hedgedoc/pull/1375 (Patch, Third Party Advisory)
- github.com/hedgedoc/hedgedoc/pull/1513 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-39175?
- CVE-2021-39175 is a high-severity vulnerability in Hedgedoc, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.1/10. Published 2021-08-30.
- How severe is CVE-2021-39175?
- High severity. CVSS v3 base score is 8.1 out of 10.