Security readout for executives and security teams
Plain-English summary
CVE-2023-26735 concerns Prometheus blackbox_exporter v0.23.0. The reported issue is that an exposed probe interface may let unauthenticated users make the service reach internal systems, revealing internal ports, services, or downloadable resources. The CVE is disputed because blackbox_exporter supports configurable authentication.
Executive priority
Prioritize review if blackbox_exporter is internet-accessible or reachable by broad internal networks. The business risk is unintended exposure of internal services through monitoring infrastructure. If authentication and network restrictions are already enforced, urgency is reduced but validation is still warranted.
Technical view
The CVE describes an access-control weakness in the blackbox_exporter probe interface, mapped to CWE-918 and scored CVSS 7.5. The risk is server-side request behavior through probing, potentially exposing internal network information or resources. Public references include GitHub issues and the project’s TLS/basic authentication documentation.
Likely exposure
Highest exposure is for organizations running blackbox_exporter v0.23.0 with the probe interface reachable from untrusted networks and without authentication. Exposure is lower where access is restricted, authentication is configured, or the exporter is only reachable by trusted monitoring systems.
Exploitation context
No CISA KEV listing or provided source confirms active exploitation. The issue is practical if an attacker can reach the probe interface and influence probing targets. The CVE record notes third-party dispute because authentication can be configured.
Researcher notes
Evidence is limited and partly disputed. The CVE names v0.23.0 and describes SSRF-like probing impact, but provided sources do not identify a patch version or confirmed exploitation. Focus assessment on endpoint reachability, authentication state, and whether probes can target sensitive internal resources.
Mitigation direction
- Identify any blackbox_exporter v0.23.0 deployments.
- Restrict probe interface access to trusted monitoring networks.
- Enable supported TLS and basic authentication where appropriate.
- Check current Prometheus blackbox_exporter guidance and issue discussions.
- Avoid exposing exporter management or probe endpoints publicly.
Validation and detection
- Inventory exposed blackbox_exporter instances and versions.
- Confirm whether the probe interface is reachable externally.
- Verify TLS and basic authentication are configured if required.
- Review network controls around monitoring components.
- Check access logs for unexpected probe activity.
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-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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 lookupCVE-2023-26735 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.
SSVC decision data
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:N/UI:N/S:U/C:H/I:N/A:N3.93.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/prometheus/blackbox_exporter/issues/1024CVE reference, mitre
- https://github.com/prometheus/blackbox_exporter/issues/1025CVE reference, mitre
- https://github.com/prometheus/blackbox_exporter/issues/1026CVE reference, mitre
- https://github.com/prometheus/blackbox_exporter#tls-and-basic-authenticationCVE reference, mitre
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.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.