A security flaw was found in Ansible Tower when requesting an OAuth2 token with an OAuth2 application.

published 2021-05-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3139

cvss: 7.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits: 0; none known

A security flaw was found in Ansible Tower when requesting an OAuth2 token with an OAuth2 application. Ansible Tower uses the token to provide authentication. This flaw allows an attacker to obtain a refresh token that does not expire. The original token granted to the user still has access to Ansible Tower, which allows any user that can gain access to the token to be fully authenticated to Ansible Tower. This flaw affects Ansible Tower versions before 3.6.4 and Ansible Tower versions before 3.5.6.

Patch / fix

fixed in 1

redhat ansible_tower 3.5.6, 3.6.4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10709 updated 2026-06-26 cvss 7.1

Tower: OAuth2 refresh tokens do not respect the expiration

Red Hat Ansible Tower 3 ansible-tower
affected: workaround, no fix available “Whenever is possible, deleting the user from Ansible Tower is the only way to mitigate the authentication of OAuth2 tokens.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD	2.0	3.6	AV:L/AC:L/Au:N/C:P/I:P/A:N

Affected products

n/a Tower

Classification

Weakness

CWE-287 Improper Authentication
CWE-613 DEPRECATED: Insufficient Session Expiration

References

bugzilla.redhat.com /show_bug.cgi?id=1824033
issue-tracking, vendor-advisory

Sources

CVE List CVE-2020-10709
NVD CVE-2020-10709

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