CVE-2018-20859 json
edx-platform before 2018-07-18 allows XSS via a response to a Chemical Equation advanced problem.
published 7y ago modified 4mo ago also EUVD-2018-13397
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
edx-platform before 2018-07-18 allows XSS via a response to a Chemical Equation advanced problem.
Patch / fix
- edx edx-platform 2018-07-18
Is CVE-2018-20859 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
1.20% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/edx/edx-platform/commit/5b144559fbdba7ff673cc1c165aa2d343e07b6bd.patch
patch, third-party-advisory
-
patch-diff.githubusercontent.com
/raw/edx/edx-platform/pull/18639.patch
patch, third-party-advisory
- groups.google.com /forum/#%21topic/openedx-announce/wsm5mtUhhME
Sources
- CVE List CVE-2018-20859
- NVD CVE-2018-20859
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.