Jenkins cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Jenkins. It has been rated as problematic. Impacted is an unknown function. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2026-27099. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Jenkins (version unknown) and classified as problematic. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Jenkins 2.483 through 2.550 (both inclusive), LTS 2.492.1 through 2.541.1 (both inclusive) does not escape the user-provided description of the "Mark temporarily offline" offline cause, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Agent/Configure or Agent/Disconnect permission.

The advisory is shared at jenkins.io. This vulnerability is known as CVE-2026-27099 since 02/17/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 299406 (Jenkins LTS < 2.541.2 / Jenkins weekly < 2.551 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (299406) and CERT Bund (WID-SEC-2026-0456). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Jenkins Jenkins

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 8.0
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 299406
Nessus Name: Jenkins LTS < 2.541.2 / Jenkins weekly < 2.551 Multiple Vulnerabilities

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

02/17/2026 CVE reserved
02/18/2026 +1 days Advisory disclosed
02/18/2026 +0 days VulDB entry created
02/21/2026 +3 days VulDB entry last update

Sourcesinfo

Advisory: jenkins.io
Status: Confirmed

CVE: CVE-2026-27099 (🔒)
GCVE (CVE): GCVE-0-2026-27099
GCVE (VulDB): GCVE-100-346549
CERT Bund: WID-SEC-2026-0456 - Jenkins: Mehrere Schwachstellen

Entryinfo

Created: 02/18/2026 17:04
Updated: 02/21/2026 18:45
Changes: 02/18/2026 17:04 (52), 02/19/2026 01:30 (2), 02/20/2026 10:21 (7), 02/21/2026 18:45 (12)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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