CVE-2021-26921Network attack vector

Persistent account access via missing JWT status check

Published Feb 9, 2021 · Updated Aug 3, 2024

Improper session invalidation in Argo CD before 1.7.12 and 1.8.0 through 1.8.3 allows remote authenticated users to retain access. The SessionManager.Parse method accepted a signed local-user JWT without checking the account Enabled flag, so deactivation did not invalidate an existing token. Exploitation requires a token issued through interactive password login; the token preserves the disabled account's authorized API access.

CVSS severity6.5
Medium
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper session invalidation in Argo CD before 1.7.12 and 1.8.0 through 1.8.3 allows remote authenticated users to retain access. The SessionManager.Parse method accepted a signed local-user JWT without checking the account Enabled flag, so deactivation did not invalidate an existing token. Exploitation requires a token issued through interactive password login; the token preserves the disabled account's authorized API access.

The record

CVE
CVE-2021-26921
Published
Feb 9, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5OSVCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 exploitUnconfirmed

Weakness, pattern, technique

T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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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