Cross-site scripting in Contentful

published 2020-05-21 6 y ago modified 2026-07-06 4 mo ago also GHSA-g5j6-r3x9-gf2m , PYSEC-2026-626 , EUVD-2021-1319

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.1%; EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits: 0; none known, plus a Nuclei check

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

Patch / fix

fixed in 1

pypi contentful 1.12.4

Exploit prediction

2.06% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Contentful <=2020-05-21 - Cross-Site Scripting nuclei detection template
github.com https://github.com/contentful/the-example-app.py/issues/44 referenced PoC, tagged "exploit" by a source, unverified

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
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
OSV	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	contentful	<1.12.4	1.12.4

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /contentful/the-example-app.py/issues/44
web, exploit, issue-tracking, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-13258
advisory
pypi.org /project/contentful
package
github.com /advisories/GHSA-g5j6-r3x9-gf2m
advisory

Sources

Fencer Vulns 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.

Summary