What it is
CVE-2026-53435 is a vulnerability affecting Jenkins Project Jenkins. In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins...
Vulnerability report
Exploited in the wild
High confidence
Not in CISA KEV
CVE-2026-53435
GitHub Advisory: GHSA-G2XQ-2V27-4RH3 (GitHub)
Jenkins
Jenkins project / Jenkins · All versions (default: affected)
- Severity
- CVSS 8.8 · High
- Confidence
- High
- Exploit status
- Exploited in the wild
- EPSS
- 19.0%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is high.
Who is affected?
Jenkins Project / Jenkins all versions (default: affected).
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Jenkins
In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for attackers to have Jenkins deserialize arbitrary types defined in Jenkins core or plugins from an attacker-controlled `config.xml` submission in a way that allows them to handle HTTP requests afterwards.
This can be used to impersonate any user and send HTTP requests on their behalf, up to and including use of the Script Console to run arbitrary code, or to read arbitrary files from the Jenkins controller.
Vendor
Product
Affected
Status
Jenkins Project
Jenkins
Before *
Unaffected
Jenkins Project
Jenkins
Before 2.555.*
Unaffected
- Published
- 10 Jun 2026
- Exploitation Reported
- 15 Jun 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
CVE References
- Jenkins Security Advisory 2026-06-10 jenkins.io · Vendor Advisory https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3707
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
Defused Cyber
Independent exploitation attestation added to the KEV Intelligence record.
Proof of concept available
GitHub
Public scanner or PoC coverage increases practical exploitability.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| Defused Cyber First | 2026-06-15 09:02 UTC |
| Daily CyberSecurity | 2026-06-15 10:20 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
19.0%
Weaknesses
Recent mention · Daily CyberSecurity
Jenkins RCE Vulnerability CVE-2026-53435 Now Under Active Exploitation
Attackers are already abusing a critical Jenkins RCE vulnerability in the wild. Tracked as CVE-2026-53435, the flaw lets The post Jenkins RCE Vulnerability CVE-2026-53435 Now Under Active Exploitation appeared first on Daily CyberSecurity. Related posts: High-Severity RCE...
Read full advisoryPotential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
AmesianX/CVE-2026-53435
github · Created 2026-06-12 14:50:22 UTC · 0 stars
An offensive security researcher + an AI vs. a fresh n-day: building the first public PoC for CVE-2026-53435 in one Friday night. Raw 8h20m log inside.
Timeline
From disclosure to observed exploitation
-
KEV confirmed by Daily CyberSecurity
Exploitation attested by an external source
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
Public PoC available
Public proof-of-concept code published
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2026-53435
Free JSON includes basic KEV fields{
"cve_id": "CVE-2026-53435",
"confidence": "High",
"cvss_score": 8.8,
"epss_score": 0.19035,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}