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CVE-2026-119566VulnerabilityPublished

Microsoft · Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-119566· Medium 6.3

Not known to be exploited · CVSS 6.3 Medium · patch available : update Microsoft when convenient.

Data as of 5 Nov 2026, 09:07 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.06.3
CNA (VulnCheck)CVSS 3.14.8
EPSS
0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
prometheusprometheusAffected
  • <=3.15.1
Fixed in–
GitHubprometheuspkg:github/prometheusOther threatsAffected
  • <=3.15.1
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, users should review and restrict remote_write configurations to trusted hosts and monitor for unusual redirect behavior.

Description

CVE-2026-119566 is a vulnerability in Prometheus up to version 3.15.1 involving credential leakage via remote_write cross-host redirects. The issue relates to improper handling of remote_write requests that can lead to exposure of sensitive credentials. The affected version explicitly stated is 3.0. No CVSS score or detailed impact metrics are provided.

References

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