CyberSecBulletin
CVE-2026-42151NVD status: Modified

prometheus: Exposure of Sensitive Information to an Unauthorized Actor

Published Updated By the CyberSecBulletin desk

CVE-2026-42151 is a high-severity exposure of sensitive information to an unauthorized actor vulnerability in prometheus, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected prometheus versions: < 3.5.3; >= 3.6.0, < 3.11.3. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.35% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of prometheus you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on github.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Prometheusprometheus< 3.5.3; >= 3.6.0, < 3.11.3Not stated
Red HatRed Hat Enterprise Linux 10Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP SolutionsNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportNot specified in the recordNot stated
Red HatRHEM 1.0 for RHEL 9Not specified in the recordNot stated
Red HatRHEM 1.1 for RHEL 10Not specified in the recordNot stated
Red HatRHEM 1.1 for RHEL 9Not specified in the recordNot stated
Red HatLogging for Red Hat OpenShift 6Not specified in the recordNot stated
Red HatLogging for Red Hat OpenShift 6.2Not specified in the recordNot stated
Red HatLogging Subsystem for Red Hat OpenShift 6.5Not specified in the recordNot stated
Red HatMulticluster Global Hub 1.4.5Not specified in the recordNot stated
Red HatMulticluster Global Hub 1.6.5Not specified in the recordNot stated
Red HatMulticluster Global Hub 1.7.0Not specified in the recordNot stated
Red HatOpenShift File Integrity Operator - FIO 1Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.11Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.13Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.14Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.15Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.17Not specified in the recordNot stated
Red HatRed Hat Edge Manager 1.0Not specified in the recordNot stated
Red HatRed Hat Edge Manager 1.1Not specified in the recordNot stated
Red HatRed Hat Hardened ImagesNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 30 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by CNA (github.com).

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighCNA (github.com)
CVSS 3.17.5HighCNA

Official description

Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the client_secret field in the Azure AD remote write OAuth configuration (storage/remote/azuread) was typed as string instead of Secret. Prometheus redacts fields of type Secret when serving the configuration via the /-/config HTTP API endpoint. Because the field was a plain string, the Azure OAuth client secret was exposed in plaintext to any user or process with access to that endpoint. This issue has been patched in versions 3.5.3 and 3.11.3.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

How developers prevent this class of flaw

  • Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

More Exposure of Sensitive Information to an Unauthorized Actor vulnerabilities (CWE-200)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in prometheus

All prometheus vulnerabilities

Recent Exposure of Sensitive Information to an Unauthorized Actor vulnerabilities

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