CVE-2018-20858
Cross-site scripting in recommender-xblock
Recommender before 2018-07-18 allows XSS.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
Recommender before 2018-07-18 allows XSS.
- Record
CVE-2018-20858- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
Recommender before 2018-07-18 allows XSS.
- Record
CVE-2018-20858- Updated
- 2026-11-02
EUVDEUVD-2019-0120 No score
Recommender before 2018-07-18 allows XSS.
- Record
EUVD-2019-0120- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3j5x-7ccf-ppgm
Cross-site scripting in recommender-xblock
Recommender before 1.3.1 allows XSS. It is possible for a learner to craft a fake resource to recommender, that includes script which could possibly steal credentials from staff if they are lured into viewing the recommended resource.
- Record
GHSA-3j5x-7ccf-ppgm- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
Recommender before 2018-07-18 allows XSS.
- Record
CVE-2018-20858- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-3j5x-7ccf-ppgm
Cross-site scripting in recommender-xblock
Recommender before 1.3.1 allows XSS. It is possible for a learner to craft a fake resource to recommender, that includes script which could possibly steal credentials from staff if they are lured into viewing the recommended resource.
- Record
GHSA-3j5x-7ccf-ppgm- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVPYSEC-2019-219 No score
Recommender before 2018-07-18 allows XSS.
- Record
PYSEC-2019-219- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
recommender-xblockPyPI |
before 1.3.1 | 1.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-20858 is a medium vulnerability (CVSS 6.1) in Edx Recommender, published August 9, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.85%, the 58th percentile. Fixed in recommender-xblock 1.3.1.