Security readout for executives and security teams
Plain-English summary
Argo CD could expose secret data in web UI error messages and logs when invalid edits were made. The business risk is unintended disclosure of deployment secrets to users or systems that can view those errors or logs. The issue is limited to older 1.7 and 1.8 releases.
Executive priority
Treat this as a moderate confidentiality issue. Prioritize upgrades where Argo CD manages sensitive deployment secrets or where logs are available to broad engineering, support, or observability audiences.
Technical view
CVE-2021-23135 is CWE-497 in Argo CD’s web UI. A low-privileged local attacker, with user interaction according to CVSS, could cause secret data to appear in UI errors and logs. Affected versions are Argo CD 1.8 before 1.8.7 and 1.7 before 1.7.14.
Likely exposure
Exposure is most likely in environments still running Argo CD 1.7.x or 1.8.x below the fixed versions, especially where multiple users can edit resources through the UI or where application logs are broadly accessible.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The likely scenario is misuse by an authenticated user or compromised account causing secret exposure through invalid UI edits and then reading resulting errors or logs.
Researcher notes
Key evidence comes from the CVE record and Argo CD advisory. The bundle identifies affected version ranges, CWE-497, CVSS 5.9, and no KEV signal. It does not provide evidence of public exploitation or additional affected products.
Mitigation direction
- Upgrade Argo CD 1.8 deployments to 1.8.7 or later.
- Upgrade Argo CD 1.7 deployments to 1.7.14 or later.
- Restrict access to Argo CD web UI editing functions.
- Limit access to Argo CD logs containing error output.
- Review vendor advisory guidance before operational changes.
Validation and detection
- Inventory Argo CD versions across all clusters and environments.
- Confirm no deployment runs 1.8 before 1.8.7 or 1.7 before 1.7.14.
- Review Argo CD logs for accidental secret exposure around UI edit errors.
- Check who can view Argo CD UI errors and operational logs.
- Verify upgrade completion through package, image, or deployment metadata.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-497: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-23135 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N1.54Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/argoproj/argo-cd/security/advisories/GHSA-fp89-h8pj-8894CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive System Information to an Unauthorized Control Sphere
Exposure of Sensitive System Information to an Unauthorized Control Sphere represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.