Security readout for executives and security teams
Plain-English summary
Cachet deployments before 2.5.1 can expose sensitive configuration values to any authenticated user, even a low-privilege one. Exposed values may include the application key, database credentials, email passwords, and other secrets, creating a serious risk of broader compromise.
Executive priority
Treat this as a high-priority remediation for any internet-facing or broadly accessible Cachet instance. The business risk is secret exposure, which can turn a low-privilege account into infrastructure or data compromise if credentials are reused or privileged.
Technical view
The issue affects fiveai Cachet versions before 2.5.1. The advisory attributes the leak to configuration handling in UpdateConfigCommandHandler and nested variable behavior in the generated dotenv configuration. CVSS 3.1 is 8.8 with network access, low complexity, and required low privileges.
Likely exposure
Organizations running self-hosted Cachet versions below 2.5.1 are exposed, especially where the administration dashboard is reachable by untrusted users or broad internal networks.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. Public research discusses Cachet configuration injection and code execution risk, but this assessment should not assume exploitation without local evidence.
Researcher notes
Focus review on Cachet versions before 2.5.1 and authenticated access boundaries. The advisory names configuration leakage from dotenv values and the 2.5.1 fix preventing nested variables. Evidence is strong for affected versions and fix, but incomplete for observed in-the-wild exploitation.
Mitigation direction
- Upgrade Cachet to version 2.5.1 or later.
- Restrict administration dashboard access to trusted source IP addresses.
- Review vendor advisory and release notes before applying changes.
- Rotate exposed application, database, and email secrets if compromise is suspected.
Validation and detection
- Inventory Cachet instances and confirm running versions.
- Verify no Cachet deployment below 2.5.1 remains reachable.
- Confirm administration dashboard access is limited to trusted networks.
- Review logs for unusual authenticated access to administrative configuration areas.
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
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ATT&CK lookup starting points
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CWE-75: Exact CWE lookup
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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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-39174 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/fiveai/Cachet/releases/tag/v2.5.1CVE reference · x_refsource_MISC
- https://github.com/fiveai/Cachet/security/advisories/GHSA-88f9-7xxh-c688CVE reference · x_refsource_CONFIRM
- https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/CVE 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.
Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)
Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.