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CVE-2026-18660VulnerabilityPublished

Rundeck:

Affects rundeckSource GCVE Database

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Authoritative record:CVE-2026-18660· High 8.8

Not known to be exploited · CVSS 8.8 High : upgrade to 6.0.1-r11 soon.

Data as of 13 Nov 2026, 01:27 UTC

CVSS 4.0 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 24% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.0.1-r11
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 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 12 Nov 2026.

What to do

Upgrade rundeck to 6.0.1-r11.

Affected software

ProductAffectedFixed in
CleanStartrundeckpkg:apk/cleanstart/rundeckOther threatsAffected
  • <6.0.1-r11
Fixed in
  • 6.0.1-r11

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

AI-suggested

Upgrade Rundeck to version 6.0.1-r11 or later, where this vulnerability has been fixed. Applying this official patch will mitigate the risk of unauthorized host access due to case sensitivity in the whitelist/blacklist.

Description

A security vulnerability in Rundeck affects the Eclipse Jetty components 'jetty-server' and 'jetty-proxy' where the host whitelist/blacklist is case-sensitive. This allows hosts that differ only by case to bypass the whitelist/blacklist restrictions. The issue affects Rundeck versions prior to 6.0.1-r11 and has a high severity CVSS score of 8.8. A fix is available in version 6.0.1-r11.

References

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