CVE-2025-68166VulnerabilityPublished 16 Dec 2025

CVE-2025-68166: JetBrains TeamCity · Cross-site Scripting

Affects JetBrains TeamCitySource CVE Database V5

Not known to be exploited · CVSS 5.4 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
JetBrains TeamCity	Affected =0	Fixed in–

AI-suggested

1. Upgrade JetBrains TeamCity to version 2025.11 or later as soon as the patch is released to ensure the vulnerability is fully remediated. 2. Until patching is possible, restrict access to the TeamCity web interface, especially the OAuth connections tab, using network segmentation, VPNs, or IP whitelisting to limit exposure. 3. Implement strict Content Security Policies (CSP) in the TeamCity web server configuration to reduce the risk of script injection and execution. 4. Conduct a thorough review of custom plugins or integrations that interact with the OAuth connections tab to ensure they do not introduce additional XSS risks. 5. Educate users about the risks of clicking on suspicious links or interacting with untrusted content within TeamCity interfaces. 6. Monitor logs and user activity for unusual behavior indicative of attempted exploitation. 7. Employ web application firewalls (WAFs) with rules targeting DOM-based XSS patterns to provide an additional layer of defense. 8. Regularly audit and sanitize all user inputs and outputs related to OAuth and authentication features in TeamCity.

Description

CVE-2025-68166 is a medium-severity DOM-based Cross-Site Scripting (XSS) vulnerability affecting JetBrains TeamCity versions prior to 2025.11. The flaw exists on the OAuth connections tab, where untrusted input is improperly handled, allowing an attacker to execute arbitrary scripts in the context of the victim's browser. Exploitation requires user interaction but no authentication, and can lead to limited confidentiality and integrity impacts without affecting availability. No known exploits are currently reported in the wild. European organizations using TeamCity for continuous integration and deployment could face targeted attacks leveraging this vulnerability, especially those with public-facing or internally accessible TeamCity instances. Mitigation involves updating to the fixed version 2025.11 once available and implementing strict input validation and Content Security Policies. Countries with significant software development sectors and high adoption of JetBrains tools, such as Germany, France, and the UK, are most likely to be affected. Given the medium CVSS score of 5.

Impact

For European organizations, the impact of CVE-2025-68166 can range from unauthorized disclosure of sensitive information to manipulation of user sessions within TeamCity environments. Since TeamCity is widely used in software development pipelines, exploitation could allow attackers to hijack developer sessions, potentially leading to further attacks such as code injection or unauthorized access to build artifacts. Although availability is not impacted, the integrity and confidentiality of development workflows could be compromised, affecting software supply chain security. Organizations with publicly accessible or poorly segmented TeamCity servers are at higher risk. The medium severity indicates that while the vulnerability is not critical, it can serve as an entry point for more sophisticated attacks if combined with other vulnerabilities or social engineering. Given the reliance on continuous integration tools in European tech sectors, this vulnerability could disrupt development operations and erode trust in software integrity if exploited.

Summary

CVE-2025-68166 is a DOM-based Cross-Site Scripting (XSS) vulnerability identified in JetBrains TeamCity, a popular continuous integration and deployment server. The vulnerability specifically affects versions prior to 2025.11 and is located on the OAuth connections tab within the TeamCity web interface. DOM-based XSS occurs when client-side scripts write untrusted data to the Document Object Model without proper sanitization, enabling attackers to inject malicious JavaScript code that executes in the context of the victim's browser session. This flaw does not require authentication, meaning any user who can access the OAuth connections tab can potentially trigger the vulnerability, although user interaction is necessary to exploit it. The CVSS v3.1 base score is 5.4 (medium), reflecting a network attack vector with low complexity and no privileges required, but requiring user interaction. The impact includes limited confidentiality and integrity compromise, such as theft of session tokens or manipulation of client-side data, but does not affect system availability. No public exploits or active exploitation have been reported to date. The vulnerability highlights the importance of secure coding practices in web interfaces, particularly those handling OAuth and authentication-related features. JetBrains has reserved the CVE and is expected to release a patch in version 2025.11. Until then, affected users should apply mitigations to reduce risk.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
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.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

jetbrains.com/privacy-security/issues-fixed/ (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 23 Dec 2025, 15:59 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

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