CVE-2020-12283Public exploitNetwork attack vector

OAuth token exposure via protocol-relative redirect

Published Apr 30, 2020 · Updated Aug 4, 2024

Open redirect in Sourcegraph before 3.15.1 allows remote attackers to redirect users to arbitrary sites through a crafted authentication URL. SafeRedirectURL in cmd/frontend/auth/redirect.go parses attacker-controlled input, checks only that the resulting path starts with '/', and therefore returns a protocol-relative //example.com path to the browser. Exploitation requires a user to follow the crafted link; in the OAuth flow, the off-site redirect exposes the partial OAuth token to the attacker-controlled destination.

CVSS severity6.1
Medium
EPSS probability1.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Sourcegraph before 3.15.1 allows remote attackers to redirect users to arbitrary sites through a crafted authentication URL. SafeRedirectURL in cmd/frontend/auth/redirect.go parses attacker-controlled input, checks only that the resulting path starts with '/', and therefore returns a protocol-relative //example.com path to the browser. Exploitation requires a user to follow the crafted link; in the OAuth flow, the off-site redirect exposes the partial OAuth token to the attacker-controlled destination.

The record

CVE
CVE-2020-12283
Published
Apr 30, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601, CAPEC-178, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1528Steal Application Access Token

Public exploit references

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Technologies

Your stack

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Your stack

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