CVE-2026-53435
High PUBLISHEDIn 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...
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Jun 10, 2026
- Exploitation Reported
- Jun 15, 2026
- CVSS
- 8.8 High
- EPSS
- 14.9%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Red Hat |
OpenShift Developer Tools and Services
|
All versions (default: affected) |
Affected |
| Jenkins Project |
Jenkins
|
2.568 to < * |
Unaffected |
| Jenkins Project |
Jenkins
|
2.555.3 to < 2.555.* |
Unaffected |
CVE References
- Jenkins Security Advisory 2026-06-10 jenkins.io · Vendor Advisory https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3707
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel 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 |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-06-15 09:02:00 UTC · Defused Cyber
Proof of concept available
Recorded 2026-06-12 14:50:22 UTC · GitHub
Weaknesses (CWE)
-
Deserialization of Untrusted Data
Recent Mentions
Daily CyberSecurity · Jun 15, 2026
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 and XSS Flaws Found in Popular CI/CD Jenkins Plugins CVE-2025-30023: Critical RCE Vulnerability Discovered in Axis Video Management Software CISA KEV Alert: FortiWeb RCE Flaw (CVE-2025-58034) Under Active Exploitation for Command Injection
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
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
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
10:20 UTC about 1 month ago10:20 UTC · about 1 month ago
KEV confirmed by Daily CyberSecurity
Exploitation attested by an external source
-
09:02 UTC about 1 month ago09:02 UTC · about 1 month ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
14:50 UTC about 1 month ago14:50 UTC · about 1 month ago
Public PoC available
Public proof-of-concept code published
-
13:05 UTC about 1 month ago13:05 UTC · about 1 month ago
CVE published
Vulnerability disclosed publicly
-
14:26 UTC about 1 month ago14:26 UTC · about 1 month ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-53435
{
"cve_id": "CVE-2026-53435",
"title": "In Jenkins 2.567 and earlier, LTS 2.555.2 and earlier, it is possible for att...",
"affected_vendor": "Jenkins Project",
"affected_product": "Jenkins",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 8.8,
"epss_score": 0.14907,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}