How severe is CVE-2023-26735?

CVE-2023-26735 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-26735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26735?

CVE-2023-26735 affects Prometheus Blackbox Exporter. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26735?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-26735 published?

CVE-2023-26735 was published on 2023-04-26 and last updated on 2026-07-04.

CVE-2023-26735

CVE-2023-26735 is a high-severity vulnerability in Prometheus Blackbox Exporter with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Prometheus Blackbox Exporter
Published: 2023-04-26
Last modified: 2026-07-04

Description

blackbox_exporter v0.23.0 was discovered to contain an access control issue in its probe interface. This vulnerability allows attackers to detect intranet ports and services, as well as download resources. NOTE: this is disputed by third parties because authentication can be configured.

Frequently asked questions

What is CVE-2023-26735?: blackbox_exporter v0.23.0 was discovered to contain an access control issue in its probe interface. This vulnerability allows attackers to detect intranet ports and services, as well as download resources. NOTE: this is disputed by third parties because authentication can be configured.
How severe is CVE-2023-26735?: CVE-2023-26735 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-26735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26735?: CVE-2023-26735 affects Prometheus Blackbox Exporter. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-26735 published?: CVE-2023-26735 was published on 2023-04-26 and last updated on 2026-07-04.

References

Affected products (1)

cpe:2.3:a:prometheus:blackbox_exporter:0.23.0:*:*:*:*:*:*:*

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