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VulnerabilityPublished

CVE-2026-49376: JetBrains TeamCity · Incorrect Authorization

Affects JetBrains TeamCitySource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 2026.1 when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2026.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 29 Oct 2026.

What to do

Upgrade TeamCity and org.jetbrains.teamcity/teamcity-server to 2026.1.

Affected software

ProductAffectedFixed in
JetBrainsTeamCityAffected
  • <2026.1
Fixed in
  • 2026.1
Mavenorg.jetbrains.teamcity/teamcity-serverpkg:maven/org.jetbrains.teamcity/teamcity-serverOther threatsAffected
  • <2026.1
Fixed in
  • 2026.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

No specific temporary mitigations are documented at this time.

Description

CVE-2026-49376 is a medium severity vulnerability in JetBrains TeamCity prior to version 2026.1 involving insufficient username validation in the SAML plugin. This weakness corresponds to CWE-863, which relates to improper authorization. The vulnerability could allow unauthorized access or actions due to inadequate validation of usernames during SAML authentication.

References

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