CVE-2026-28513Public exploitNetwork attack vector

Unauthorized token issuance via conjunctive code validation

Published Mar 9, 2026 · Updated Mar 9, 2026

Incorrect authorization in Pocket ID before 2.4.0 allows remote authenticated users to obtain tokens through the OIDC token endpoint. In backend/internal/service/oidc_service.go, the endpoint rejects a code only when its client ID is wrong and it is expired, using conjunction where either failure must reject it. An OIDC client operator can exchange codes issued to other clients for user tokens, and a correct client can reuse an expired code until the 24-hour cleanup job removes it.

CVSS severity8.5
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Pocket ID before 2.4.0 allows remote authenticated users to obtain tokens through the OIDC token endpoint. In backend/internal/service/oidc_service.go, the endpoint rejects a code only when its client ID is wrong and it is expired, using conjunction where either failure must reject it. An OIDC client operator can exchange codes issued to other clients for user tokens, and a correct client can reuse an expired code until the 24-hour cleanup job removes it.

The record

CVE
CVE-2026-28513
Published
Mar 9, 2026
Updated
Mar 9, 2026
Vendor
Pocket ID
Product
Pocket ID
Classifications
CWE-863, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 9, 2026Record 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=< 2.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pocket ID · Pocket IDversion=< 2.4.0

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
8.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1528Steal Application Access Token

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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