CVE-2020-17526

Name: CVE-2020-17526
Creator: NVD / NIST
Published: 2020-12-21T17:15:12.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.7/10EPSS 23.34%

Last modified Jun 17, 2026

CVE-2020-17526 is a high-severity vulnerability rated 7.7/10 on the CVSS scale. Incorrect Session Validation in Apache Airflow Webserver versions prior to 1.10.14 with default config allows a malicious airflow user on site A where they log in normally, to access unauthorized Airflow Webserver on Site B through the session from Site A. This does not affect users who have changed the default value for `[webserver] secret_key` config.. EPSS estimates a 23.34% chance of exploitation in the next 30 days.

Description

Incorrect Session Validation in Apache Airflow Webserver versions prior to 1.10.14 with default config allows a malicious airflow user on site A where they log in normally, to access unauthorized Airflow Webserver on Site B through the session from Site A. This does not affect users who have changed the default value for `[webserver] secret_key` config.

Metrics

CVSS 3.1

7.7/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS Probability

23.34%

97.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Apache	Airflow	< 1.10.14

References

http://www.openwall.com/lists/oss-security/2020/12/21/1Mailing List, Third Party Advisory
https://lists.apache.org/thread.html/r466759f377651f0a690475d5a52564d0e786e82c08d5a5730a4f8352%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/rbeeb73a6c741f2f9200d83b9c2220610da314810c4e8c9cf881d47ef%40%3Cusers.airflow.apache.org%3EMailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2020/12/21/1Mailing List, Third Party Advisory
https://lists.apache.org/thread.html/r466759f377651f0a690475d5a52564d0e786e82c08d5a5730a4f8352%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/rbeeb73a6c741f2f9200d83b9c2220610da314810c4e8c9cf881d47ef%40%3Cusers.airflow.apache.org%3EMailing List, Vendor Advisory

Timeline

Published: Dec 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-17526?

How severe is CVE-2020-17526?

CVE-2020-17526 has a CVSS score of 7.7/10 (HIGH severity). The EPSS model estimates a 23.34% probability of exploitation in the next 30 days.

How do I fix CVE-2020-17526?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-17526?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST