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VulnerabilityPublished

CVE-2026-33002: Jenkins · CWE-350

Affects JenkinsSource CVE Database V5

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Not known to be exploited · CVSS 7.5 High.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Mar 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 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Jenkins ProjectJenkinsAffected–Fixed in–

AI-suggested

Organizations should prioritize upgrading Jenkins to versions beyond 2.554 or LTS versions beyond 2.541.2 where this vulnerability is patched. If immediate patching is not feasible, implement network-level mitigations such as restricting access to the Jenkins CLI WebSocket endpoint to trusted IP addresses and internal networks only. Configure reverse proxies or firewalls to validate and sanitize Host and X-Forwarded-Host headers, preventing DNS rebinding attempts. Employ DNS security measures like DNS pinning or using DNS resolvers that mitigate rebinding risks. Additionally, disable or restrict the use of the CLI WebSocket endpoint if it is not essential for operations. Monitor Jenkins logs for suspicious WebSocket connection attempts and unusual command executions. Educate users about the risks of interacting with untrusted web content that could trigger DNS rebinding attacks. Finally, maintain a robust incident response plan to quickly address any signs of compromise related to this vulnerability.

Description

CVE-2026-33002 is a high-severity vulnerability in Jenkins versions 2.442 through 2.554 and LTS 2.426.3 through 2.541.2. It arises from improper origin validation on the CLI WebSocket endpoint, where Jenkins relies on the Host or X-Forwarded-Host headers to compute the expected origin. This flaw enables DNS rebinding attacks that bypass origin checks, potentially allowing remote attackers to execute unauthorized commands or actions. Exploitation requires no prior authentication but does require user interaction.

References

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