What is CVE-2020-13258?

CVE-2020-13258 is a medium-severity vulnerability in Contentful Python Example, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-05-21.

How severe is CVE-2020-13258?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2020-13258 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Contentful Python Example

CVE-2020-13258

Contentful through 2020-05-21 for Python allows reflected XSS, as demonstrated by the api parameter to the-example-app.py.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-05-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.021 (80.7th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Contentful Python Example

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/contentful/the-example-app.py/issues/44 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-13258?: CVE-2020-13258 is a medium-severity vulnerability in Contentful Python Example, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-05-21.
How severe is CVE-2020-13258?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-13258 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.