CVE-2020-12624Network attack vector

Remote session hijacking via leaked bearer token

Published May 3, 2020 · Updated Aug 4, 2024

The League application before 2020-05-02 on Android allows remote attackers to hijack sessions by sending bearer tokens to arbitrary image hosts. A reused OkHttp client carries the HTTP Authorization bearer header from League requests into requests for externally hosted images, disclosing the token to an attacker-controlled site. Exploitation requires a user to load content containing an external image; the recipient can then use the exposed token to impersonate that session, with no stated ability to alter data or interrupt service.

CVSS severity6.5
Medium
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

The League application before 2020-05-02 on Android allows remote attackers to hijack sessions by sending bearer tokens to arbitrary image hosts. A reused OkHttp client carries the HTTP Authorization bearer header from League requests into requests for externally hosted images, disclosing the token to an attacker-controlled site. Exploitation requires a user to load content containing an external image; the recipient can then use the exposed token to impersonate that session, with no stated ability to alter data or interrupt service.

The record

CVE
CVE-2020-12624
Published
May 3, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-459, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 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

4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-459Incomplete Cleanup
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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