CVE-2026-100255
CVE-2026-100255 is a high-severity vulnerability in Jetbrains Teamcity with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1289.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- EPSS exploit prediction: 0% (26th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-1289
- Affected product: Jetbrains Teamcity
- Published:
- Last modified:
Description
In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 administrator account takeover was possible via password reset
Frequently asked questions
- What is CVE-2026-100255?
- In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 administrator account takeover was possible via password reset
- How severe is CVE-2026-100255?
- CVE-2026-100255 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-100255 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-100255?
- CVE-2026-100255 affects Jetbrains Teamcity. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-100255?
- 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.
- When was CVE-2026-100255 published?
- CVE-2026-100255 was published on 2026-09-30 and last updated on 2026-10-02.
References
Affected products (1)
- cpe:2.3:a:jetbrains:teamcity:*:*:*:*:*:*:*:*
More vulnerabilities in Jetbrains Teamcity
- CVE-2026-63077 — Critical (CVSS 9.8): In JetBrains TeamCity before 2026.1.3, 2025.11.7 unauthenticated remote code execution was possible via the agent…
- CVE-2024-27198 — Critical (CVSS 9.8): In JetBrains TeamCity before 2023.11.4 authentication bypass allowing to perform admin actions was possible
- CVE-2024-23917 — Critical (CVSS 9.8): In JetBrains TeamCity before 2023.11.3 authentication bypass leading to RCE was possible
- CVE-2023-42793 — Critical (CVSS 9.8): In JetBrains TeamCity before 2023.05.4 authentication bypass leading to RCE on TeamCity Server was possible
- CVE-2022-25263 — Critical (CVSS 9.8): JetBrains TeamCity before 2021.2.3 was vulnerable to OS command injection in the Agent Push feature configuration.
- CVE-2022-24340 — Critical (CVSS 9.8): In JetBrains TeamCity before 2021.2.1, XXE during the parsing of the configuration file was possible.
All CVEs affecting Jetbrains Teamcity →
Other CWE-1289 vulnerabilities
- CVE-2026-39821 — Critical (CVSS 9.6): The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For…
- CVE-2026-50090 — Critical (CVSS 9.3): The Aqara Cloud OAuth Authorization Endpoint (open-cn.aqara.com/oauth/authorize) is vulnerable to a redirect bypass due…
- CVE-2026-97196 — Critical (CVSS 9.1): Improper Validation of Unsafe Equivalence in Input vulnerability in Liquid Web / StellarWP GiveWP allows Authentication…
- CVE-2026-102478 — High (CVSS 8.7): In affected versions of Octopus Server, an authenticated user with permission to modify roles could bypass the…
- CVE-2026-86831 — High (CVSS 8.7): Improper validation of pod identifier uniqueness in aws-network-policy-agent in Amazon EKS Network Policy Agent before…
- CVE-2024-42219 — High (CVSS 7.8): 1Password 8 before 8.10.36 for macOS allows local attackers to exfiltrate vault items because XPC inter-process…