CVE-2024-39315Network attack vector

Token disclosure via full session object serialization

Published Jul 2, 2024 · Updated Aug 2, 2024

Sensitive information exposure in Pomerium before 0.26.1 allows remote authenticated users to obtain OAuth2 access and ID tokens. UserInfoData.ToJSON serializes entire session and profile protocol-buffer objects into the /.pomerium response, including raw tokens and refresh-token data. Exploitation requires a logged-in user's interaction with attacker-controlled script in a proxied upstream application; stolen tokens enable impersonation only where the upstream trusts an ID token without validating Pomerium's per-request JWT or securing the proxy connection.

CVSS severity5.7
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in Pomerium before 0.26.1 allows remote authenticated users to obtain OAuth2 access and ID tokens. UserInfoData.ToJSON serializes entire session and profile protocol-buffer objects into the /.pomerium response, including raw tokens and refresh-token data. Exploitation requires a logged-in user's interaction with attacker-controlled script in a proxied upstream application; stolen tokens enable impersonation only where the upstream trusts an ID token without validating Pomerium's per-request JWT or securing the proxy connection.

The record

CVE
CVE-2024-39315
Published
Jul 2, 2024
Updated
Aug 2, 2024
Vendor
Pomerium
Product
Pomerium
Classifications
CWE-201, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.26.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pomerium · Pomeriumversion=< 0.26.1

Published CVSS scores

5.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
T1528Steal Application Access Token

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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