6.1

CVE-2020-15233: OAuth2 Redirect URL validity does not respect query parameters and character casing for loopback addresses

Modified
AliasesGHSA-rfq3-w54c-f9q5
Published 02-10-2020Last modified 04-08-2024

Vulnerability summary

CVE-2020-15233 is a medium (CVSS 6.1) Improper Input Validation vulnerability in ory fosite. EPSS estimates a 0.80% chance of exploitation in the next 30 days, higher than 56.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.80%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 02-10-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

ORY Fosite is a security first OAuth2 & OpenID Connect framework for Go. In Fosite from version 0.30.2 and before version 0.34.1, there is an issue in which an an attacker can override the registered redirect URL by performing an OAuth flow and requesting a redirect URL that is to the loopback adapter. Attackers can provide both custom URL query parameters to their loopback redirect URL, as well as actually overriding the host of the registered redirect URL. These attacks are only applicable in scenarios where the attacker has access over the loopback interface. This vulnerability has been patched in ORY Fosite v0.34.1.

CVSS metrics

4 scores · 3 sources · 3 versions

EPSS trend

Probability

0.80%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.80% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, administrative account, user interaction (CVSS vector). Other conditions: not stated in public data.

Github.com/ory1 product
  • fosite≥ 0.30.3, < 0.34.1
Ory1 product
  • fosite< 0.34.1 | ≥ 0.30.2, < 0.34.1

2 vendors · 2 products

References

5 links