What is CVE-2020-35678?

CVE-2020-35678 is a medium-severity vulnerability in Crossbar Autobahn, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2020-12-27.

How severe is CVE-2020-35678?

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

Open Redirect in Crossbar Autobahn

CVE-2020-35678

Autobahn|Python before 20.12.3 allows redirect header injection.

Vulnerability class: Open Redirect

Published 2020-12-27 · 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: 0.014 (72.2th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: +0.000

Affected products

Crossbar Autobahn

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

github.com/crossbario/autobahn-python (Product, Third Party Advisory)
github.com/crossbario/autobahn-python/compare/v20.12.2...v20.12.3 (Patch, Third Party Advisory)
pypi.org/project/autobahn/20.12.3/ (Product, Third Party Advisory)
autobahn.readthedocs.io/en/latest/changelog.html (Release Notes, Vendor Advisory)
github.com/crossbario/autobahn-python/pull/1439 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-35678?: CVE-2020-35678 is a medium-severity vulnerability in Crossbar Autobahn, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2020-12-27.
How severe is CVE-2020-35678?: Medium severity. CVSS v3 base score is 6.1 out of 10.