Gainsight Assist OAuth Call state get request method with sensitive query strings

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Gainsight Assist. Affected by this issue is some unknown functionality of the component OAuth Call Handler. The manipulation of the argument state leads to use of get request method with sensitive query strings. This vulnerability is uniquely identified as CVE-2026-31381. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Gainsight Assist (affected version not known) and classified as problematic. This issue affects some unknown functionality of the component OAuth Call Handler. The manipulation of the argument state with an unknown input leads to a use of get request method with sensitive query strings vulnerability. Using CWE to declare the problem leads to CWE-598. The web application uses the HTTP GET method to process a request and includes sensitive information in the query string of that request. Impacted is confidentiality. The summary by CVE is:

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

The weakness was disclosed by Christopher O'Boyle. It is possible to read the advisory at rapid7.com. The identification of this vulnerability is CVE-2026-31381 since 03/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (rapid7): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use of get request method with sensitive query strings
CWE: CWE-598
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/09/2026 CVE reserved
03/20/2026 +11 days Advisory disclosed
03/20/2026 +0 days VulDB entry created
03/26/2026 +6 days VulDB entry last update

Sourcesinfo

Advisory: rapid7.com
Researcher: Christopher O'Boyle
Status: Not defined

CVE: CVE-2026-31381 (🔒)
GCVE (CVE): GCVE-0-2026-31381
GCVE (VulDB): GCVE-100-352067

Entryinfo

Created: 03/20/2026 14:59
Updated: 03/26/2026 18:09
Changes: 03/20/2026 14:59 (62), 03/26/2026 18:09 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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