How severe is CVE-2026-53435?

CVE-2026-53435 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-53435 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-53435?

CVE-2026-53435 primarily affects Jenkins. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-53435?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-53435 have an EU (EUVD) identifier?

Yes. CVE-2026-53435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36019.

When was CVE-2026-53435 published?

CVE-2026-53435 was published on 2026-06-10 and last updated on 2026-06-30.

CVE-2026-53435

CVE-2026-53435 is a high-severity vulnerability in Jenkins with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 15% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 15% (96th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36019
Weakness: CWE-502
Affected product: Jenkins
Published: 2026-06-10
Last modified: 2026-06-30

Description

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.

Frequently asked questions

What is CVE-2026-53435?: 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.
How severe is CVE-2026-53435?: CVE-2026-53435 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-53435 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 15% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-53435?: CVE-2026-53435 primarily affects Jenkins. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-53435?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-53435 have an EU (EUVD) identifier?: Yes. CVE-2026-53435 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36019.
When was CVE-2026-53435 published?: CVE-2026-53435 was published on 2026-06-10 and last updated on 2026-06-30.

References

Affected products (2)

cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

125.212.235.194 (ipv4-addr)
220.95.208.142 (ipv4-addr)