CVE-2026-49376: In JetBrains TeamCity before 2026.1 insufficient username validation in the SAML plugin

Q: How do I fix CVE-2026-49376?

teamcity: upgrade to 2026.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-49376 being exploited?

CVE-2026-49376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49376 affect?

CVE-2026-49376 affects teamcity. Severity is medium (CVSS 6.5). In JetBrains TeamCity before 2026.1 insufficient username validation in the SAML plugin

Q: How urgent is CVE-2026-49376?

Priority 31/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 6.5REMOTEUPGRADE

CVE-2026-49376 is a medium-severity flaw (CVSS 6.5) affecting teamcity. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In JetBrains TeamCity before 2026.1 insufficient username validation in the SAML plugin

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-05-29
Last modified	2026-07-22

Publisher (CNA): JetBrains s.r.o. · Vendor: jetbrains

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-29 19:16 UTCPublished CVE record published
2026-07-22 06:10 UTCUpdated Record last modified

jetbrains teamcity UPGRADE

Affected: < 2026.1

Fixed in: 2026.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy teamcity || rpm -q teamcity || teamcity --version

2. UPGRADE to 2026.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade teamcity

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade teamcity

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49376?

teamcity: upgrade to 2026.1. Exact commands for each OS are on this page.

Is CVE-2026-49376 being exploited?

CVE-2026-49376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49376 affect?

CVE-2026-49376 affects teamcity. Severity is medium (CVSS 6.5). In JetBrains TeamCity before 2026.1 insufficient username validation in the SAML plugin

How urgent is CVE-2026-49376?

Priority 31/100. Remotely exploitable, no login, no user action

Software pages

JetBrains TeamCity vulnerabilities

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References

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