CVE-2026-31381: An attacker can extract user email addresses (PII) exposed in base64 encoding via the state parameter in the O

Routine

MEDIUM 5.3REMOTEMITIGATE

CVE-2026-31381 is a medium-severity flaw (CVSS 5.3) affecting assist. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An attacker can extract user email addresses (PII) exposed in base64 encoding via the state parameter in the OAuth callback URL.

Why this priority

Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-598
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): Rapid7, Inc. · Vendor: gainsight

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 14:16 UTCPublished CVE record published
2026-06-17 10:33 UTCUpdated Record last modified

gainsight assist MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2026-31381?

assist: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-31381 being exploited?

CVE-2026-31381 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-2026-31381 affect?

CVE-2026-31381 affects assist. Severity is medium (CVSS 5.3). An attacker can extract user email addresses (PII) exposed in base64 encoding via the state parameter in the OAuth callback URL.

How urgent is CVE-2026-31381?

Priority 29/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-31382 MEDIUM 6.1 MITIGATE The error_description parameter is vulnerable to Reflected XSS

References

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